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Yes and no There is not a feature/function in macOS that will roll back patches (updates if you prefer) like can be done in Windows. But a Time Machine backup can indeed in assist you in rolling back to a previous update or upgrade. Make sure you have a current backup of the system you want to upgrade. I would also make a USB installer of your current macOS ...


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Get a big spare drive & make a bootable clone. You cannot guarantee Time Machine will let you revert. See Revert to El Capitan


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It's confirmed that issues were caused by some wireless signal interferences between/amount USB wireless devices (especially for USB+Bluetooth wireless combo devices) and the USB/Thunderbolt ports on Mac systems after firmware and OS upgrade of Mac systems. Solution: Please replace your USB+Bluetooth wireless devices with wired/USB-only devices, before Apple ...


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