There is a lot of things I don't get about in this (like WHAT were you talking about in the Seed Selection bit at the end with placing Peashooters on a roof??), but I can agree with you on why PvZ3 shouldn't be pay-to-win.
The art style the game currently has right now is fine. EA and PopCap does not need to go and change the art style again when they had updated a few plants and things in the last build they did. I think the art style it is currently stuck with is good enough, and it's THE GAME ITSELF that the PvZ fandom needs to worry about, like the game mechanics, etc.
I could also see Laura making a return somewhere in PvZ3 tho, but I'm not sure how'd that work out atm...