Anything is possible + you reap what you sow
= you can have anything if you work hard at it.
All true statements.
The fine print ofc is that "hard work" part
Nothing worth having ever comes free.
So I guess affirmations don't make your life any easier all they do is raise your own expectations by removing the wall between what you originally thought was possible and what is actually possible.
But that's probably not a big deal since if you're into affirmation you probably had high expectations to begin with.