This isn't true, there are plenty of trivial examples to counter this notion. e.g. Annapurna Interactive has been publishing AAA-quality titles from indie devs

This isn't true, there are plenty of trivial examples to counter this notion. e.g. Annapurna Interactive has been publishing AAA-quality titles from indie devs for a long time. And most of those games don't fall into the roguelike or platformer vertical.