I hope you are kidding, trolling, as those things, plus audio/video editing, started fron unix when it wasn't conceivable to do so on PCs with proprietary OS. All those corporations who later sold such sw copied/stole FOSS and dressed it up as their own.
No team or corporation can ever ever catch up to FOSS development. It is a neo-liberal fallacy that promotes them on marketing hype.
Near double the size and resources for having a dock/bar/menu and pinning icons on the background .. too much clutter for things hiding behind whatever you are doing most of the time.
A desktop is something you use to impress someone using mac/msWin ...
Many people browse 4-5 pages a day, see a few emails, print a few pdfs, and a core2duo, or x4, for 40#/$/Eu a box run flawlessly with linux and xfce/lxde for example.
Even video-conferencing works fine.
2 Do you have libnvme and nvme-cli installed? If no, try them, if yes look up things on the manuals. It may be that your bootloader can't read/mount from the nvme
3 Ever since systemd-boot appeared things have been not working so well, now, have they?
On magnetic disk there is physical location for each bit of data written, for ssd it is all virtual space handled by internal software simulating a magnetic drive. The variation from disk to disk is much higher than the sensitivity of the fs.
You want accuracy and reliability of data storage, use HDD and Raid!
A file system and a raid setup all in one with facebook's code for de-/compression ... yet another piece of software that tries to do the work for several others.
ext4 will rarely have extreme loads unless all you do is backup and mirroring. For more accurate data read/write and better checks use xfs and external journaling. On M2 it is by far the fastest solution and far more secure than ext.