I'm still on the fence about the sine behavior usage as well...
But when I started this game I had decided that I would use the game boy aesthetic to my advantage:
I don't want to limit myself to the same technical limitations of the old handheld.
I'm going to ease players into it, but the game will take extraordinary license when it comes to graphics.
If it looks to odd though, I may just make an animation for the grass blowing...