thats the thing, they do show to have. I mean in our mammalian brain we use Na+ while they use H+ ones. there are differences ofc that outright challenge that they are equiparable but they are there.
Like, ofc this is not to say plants have some sort of conciousness because that seems super far fetched but to say that plants do higher order plants could have vision in such way to identify leaf shape seems possible for me, and I dont see a very clear way this could be archieved with hormones, tho ofc, it could