I am going to big travel trip with my Mac and I have think that turn on FileVault will be a good decision, for the case if may MacBooks was stolen.
I have found the stories (https://discussions.apple.com/thread/8301725, https://mybyways.com/blog/macos-filevault-and-sierra-update-get-stuck-when-running-concurrently) that sometimes updating the Mac OS can be broken if I have FileVault turned on due to errors in updating software. In the travel I will not have the ability reinstall my MacBook, so may be it will be better to not install Mac OS updates during the trip.
May be there is something else what I need to know if I am going to turn on FileVault. Some
not to do.