1. Weapon platforms are too safe. There's no drawback to having them built. Perhaps change to require Munitions to sustain them would force players to consider their need.
2. Weapon platforms enables toxic gameplay such as constant running back to POB safety while refusing to admit defeat and yield by either blowing up or combat docking. People have high egos and would rather be toxic than humble.
3. Weapon platforms act as area-denial. In case of mining field POB - it almost completely negates pirate threat. And pirates have no counter to that. "Go pirate traders" is not a solution to this, as miners are effectively taking themselves out of equation of activity cycle involving pirates.
4. They are not anti-siege. Sieging Core 1 or 2 bases with few platforms is not hard IF you have Battleships. Sieging Core 3 or 4 bases without platforms is hard even if you have battleships. As such, back to point 2 and 3.
Now please, tell me, when did Weapon Platforms ever created better interactions or gameplay?