Another option, of course, would be to revert my commit.  I'm not in the
slightest against reverting, but I'm not yet convinced it's necessary,
as orgalist-mode currently seems to rely on the alignment of several
implementation details.

I do wonder about three things, though.

The first is whether orgalist-mode couldn't use a custom
indent-line-function instead of advising what may or may not be set to
indent-relative by the user.

The second is why advice--buffer-local does what it does.  Stefan, why
does it behave differently depending on local-variable-p?  Why can't it
simply call make-local-variable before returning the symbol-value?

The third is why indent-according-to-mode hard-codes the check for
indent-relative and indent-relative-first-indent-point.  Wouldn't it be
nice if this check instead looked up some variable akin to
electric-indent-functions-without-reindent, that can be more easily
customised?

[1]: https://debbugs.gnu.org/31361

Thanks for reporting this, and sorry for the fallout.

-- 
Basil