I'm intrigued but some are going to be objectively better than "standard" mounts, which leads to optimal styles of play. I guess it's in the implementation.
For example, if there was a ship that had a very obvious "special" Large Ballistic mount that was slaved to the ship system, that could work. It couldn't fire under normal circumstances but when the ship system is activated, it does +500% damage for a few seconds. That would lead to tactical combat decisions, meaningful choice, etc. (Getting the AI to use it intelligently might be another issue, but I digress)
I guess I would be against passive mount shenanigans that just "add X damage" or "Add X effect," even if there were good trade-offs to using it.