The audio side things has proven to be less than ideal for programs that don't follow official C= references. There was an issue with MIDI instruments functionality messing up on ADoom (now fixed) but obsolete programs will not be patched sadly. Maybe OS3.1.4 should have taken an approach of tidying up the code whilst compromising and "supporting" the best bugs as utilised by programmers under previous versions of the OS!
Supporting bugs? I prefer programmers to do their job properly and follow correct C= guidelines. I do see your point however, and hopefully the amount of badly written software that actually breaks is tiny.
Thing is, no one is being forced to install 3.1.4 and the target audiance for 3.1.4 should be people who are 'looking ahead' more than 'looking back' IMHO.