Just as a counter-point, while I'm a light user / copyist, I don't
think I've EVER used repeat unfold, while repeat percent happens a lot.
I actually quite like the "\x16 d8" idea as a shortcut, but what I'm
saying is don't think it's a good idea, just because YOU do it a lot.
Other people may have completely different work patterns ...
Yes of course, and LilyPond is a great tool for all different kinds of
work patterns. But it's not a question of making one job easier for the
price of making others harder, in which case your argument would be more
relevant.
To give an example: The fact that I never (so far) needed/used guitar
tabulature isn't an argument against improving work experience for
people who do. As long as no-one proposes syntax changes that make
guitar tabulature easier and figured bass harder, I'm very happy if the
support for guitar tabulature improves.
Lukas