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.
Every instrument, every voice, every sound in nature ... these are are all my private tutors ... 24/7 for free, and all I have to do is listen.