If I were going strictly by the word "Classic", I would suggest that means Commodore-Amiga and that PowerPC had nothing to do with Commodore's Amiga at all nor was it planned. In fact Commodore were looking at HP as their next gen chips. So do I think PowerPC had anything to do with "classic" Amiga, that's a BIG NO..
Some AGA/AA Amigas had problems with OCS/ECS games too, so I'd suggest that we live now in a time where adjustments for this kind of things is possible.