Agree with everything you said except this part. I'm actually super pissed about the hard cap on tower attack rate and I doubt I'll play the game anymore if it remains that way. Why even have an attack rate stat if you're just going to hard cap it? It's pointless and it removes a big part of the fun of the game, at least for me.
I'm not sure if this is a bug or intentional but it seems many of the towers rate of attack has been capped out on the PTR. For the apprentice the magic missile and fireball tower are capped at 0.5 attack speed. The deadly striker tower is capped at 1.0 attacks per second. Same for the Squire and his harpoon and cannon towers they are both capped at 0.5 attack speed. There are also some other strange things going on. For instance putting more points into Def. Rate won't increase the attack speed beyond the 0.5 cap but for some reason it does increase how hard the tower hits but not