> So is it time to require that RAA packages conform to these rules? 

In light of the benefits, I personally say "Yes!"

Packages not offering a --prefix option or (Better) some sort of
DESTDIR/--root option often don't get installed by me.  It's just too
much work to pack up properly in case I want to remove it -- besides, if
it's worth using, it gets installed on at least five systems -- if I
package it, I only have to do the hard work (making it non-invasive)
once.