User blog comment:Zombotanist/PvZ 2 Balance Tweaks/@comment-26942983-20160425164123/@comment-25982947-20160425205229

They wouldn't really make the game as a whole easier, cause the levels would pretty much stay the same, (save for a few unfair situations that wouldn't be as unfair). What would change are the strategies you'd be able to use in these levels, as you'd have a much more varied selection of plants that are useful in more situations.

The game is only easy if you use the same few select plants that are really strong on pretty much every level, and that's why to me it feels a bit boring now, but if the game had more options that were just as good, you'd have a much more rewarding experience by trying out new, effective strategies.