I do think the smite buffs are needless complexity, though their removal will require a lot of balance changes (a lot of junglers depended on krug smite for their first clear).
But the plants right now are kind of dumb. The "blast cone" plant (ziggs W) is going to be barely used, as it only will really be used by ranged champions when there happens to be an enemy in the exact spot where the blast cone plant is. That will probably be rare because most fights happen in the lanes or by dragon/baron, not in the jungle.
The fruit/healing plant will just nerf poke/sustain champions and buff low sustain champs with a weak laning phase.
The vision plant just seems like a way to screw over a team with a lead by making dragon/baron be easier to steal.
I think replacing smite buffs is not a terrible idea, but the three plants they are debuting seem pretty awful
Also, IDK why they are nerfing the cooldown of smite again, I remember when smite had a 40 second cooldown and that wasn't OP.