Light, and flimsy are two separate things. PSR keybeds are flimsy, and that's why I can't play them as expressively as other brands. If a PSR lineup had a Tyros keybed, I might still be a Yammmy guy.
Everyone, and everything I listen to is my teacher. Every instrument, every voice, every sound in nature ... they are all my private tutor ... 24/7 for free.