it has all been explained so well in the earlier posts, but my guts feeling tells me that for the quick reader the inherent criticality may not have fully come across.
So please forgive if i repeat most of the above statements, i just would like to try to put them into am more hands-on perspective.
Lack of information
You can't really estimate the endurance of your built in SSD until the manufacturer of the laptop lets you know which make/model/type of drive.
In this situation you can't even guess how capable these drives are of self-recuperating worn out cells.
The warranty only tells you, how long your drive (or mainboard, if soldered on) will be replaced at no cost, not how long your data is secure.
Consumers buying notebooks are typically not aware of a critical SSD specific, when they think of SSD drive failures in the same way as of components like screens or touchpads would fail:
Sure, SSDs also fail statistically driven, like ordinary conponents (screens, monitors, ...). For example because the SSD-controller fails.
This is covered by the other measure for reliability, which is referred to as "MTBF".
But this is unrelated to the question of drive wear.
And this kind of failure is typically extremely rare.
More relevant for the consumer is the fact that it is not the question IF SSDs will fail, but rather WHEN they fail.
I.o.w.: SSDs fail with approx. 100% likelehood, as soon as they are worn out.
I.e.: when data has been written to it for a technically determined total count and amount of data, specified by the manufacturer's choice at design time, by design.
This fact is covered in the measure referred to as "DWPD".
This divergence is why i believe that the failure behaviour of SSDs and it's specific criticality is typically misunderstood by typical consumers.
Adding to that criticality (1):
if one or few cells are failing without being recuperated by the automatic background wear-leveling in time, it may render the entire drive lost, not just the affected "cells".
Which is opposed to what one got accustomed to back in the days of HDDs (magnetic hard drives with spinning platters), which often died stepwise, only partially at the beginning and over a prolongued period, thus far more predictable and manageable.
Adding to that criticality (2):
notebooks with soldered on drives have often been sold with small disks (128, 256 GB; this seems to change these days in end of 2019), because bigger disks were unproportionally expensive.
This fact will substantially aggravate the wear situation, as have been pointed out above:
because users need that scarce space for their conent files they actually work with (and not just for the operating system and the applications), they have often utilised the drive storage capacity over 70% or more, which reduces the reserve for the wear-leveling mechanisms to do their healing job, which results in drive failures getting more likely.
Endurance is expensive
SSDs differ hugely in their endurance, as anybody can look up when comparing the respective measure "DWPD", often mentioned in the fine print of the tech specs of the drive.
This tells you "exactly" how much data you can write how often to this drive until it is dead (where "exactly" actually means: "statistically significantly").
And looking up this specification unveils to which extent drive endurance correlates with price, which in turn allows to estimate what to expect from undocumented drives built into products which are designed for the average user, average use cases and average product life time, which is most likely not synonymous with "enterprise" use (as in "Enterprise SSD drives", which are those special build long lasting SSDs aimed for servers and storage systems).
In this context, i deem any notebook product labeled as "Pro" to be member of the "average"-camp, not "enterprise".
Targeted use cases
Finally to put the likelihood of SSD failure into the hands-on perspective:
As said above by the earlier posters: the more often cells have to change their state, i.e.: the more frequent you change data, the earlier the drive is worn out, which can be substantially earlier then the specified warranty period.
User type A:
If your disk capacity is used by data to a typical degree, and your are regularly doing data intensive work, such as video editing of FullHD/2K/4k videos, or photo editing of full frame sensor photos, or recording music, and postprocess these media files (like cutting, changing compression level, adjusting color hue, ...), you are not that "average user" who may be safe to found their expectation for the drive longevity on the warranty specification of the disk (which is the least relevant criterion by the way).
Instead you are the type of user which is also targeted by the "creator's laptops" marketing campaign these days.
User type B:
If instead you are a gamer, or work with text documents and spreadsheets most of the time, you don't have to worry about the longevity aspect of your SSD.
When weighing the fact of SSDs soldered on to mainboards, think of it like you would consider buyng a car with undetachable tires.
And in order to estimate the resell value of your investment, possibly also ask yourself whether you would buy such a device second handed.
All of this will matter only until SSD technology will have improved the endurance enough to put the situation out of it's criticality.
But for consumer grade drives that is not today, in late 2019.