Many cheap chinese web cameras from non know brands,really problematic to make work printers which older from 2015 for example canon ,Lexmark cause they use proprietary communication protocols and thus drivers for inux or exist in shitty state which would not work on modern system but worked on Ubuntu from 2012 or not driver not exist at all and so on other very specific type of devices
I agree mostly yeah it should be by default(but also depends from usecase too if we installing distro as many people doing on old hardware it would even more slow PC)
Copy pasting would damage mac os, windows including too so it’s just human factor
Wayland is protocol not server and to implement full stack u need a lot resources and not small team meanwhile x11 it’s ready to go graphical server universal one
About this some distros installing systemd-boot if installer detecting efi variables if legacy system it installing grub.
All depends from threat surface attack and what we are trying to defend.