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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)
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Copy pasting would damage mac os, windows including too so it's just human factor
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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
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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.
Vless + reality much more advanced