I rather have increased firepower reserved for enforcers and defense reserved for marauders.

And no, a Marauder should have no drawbacks compared to a STD tank, until the siege module is activated. Then I'll accept a 50% reduction in movement speed. This isn't WWII when tanks had to move slowly or not at all to score a successful hit. This is 20,000 years in the future.

1. Bastion module is useless in PVP

2. If your not moving you are dead

Oh yeah, can't be great offense against another tank, not allowed, that's all infantry's role because they must be able to do everything with such incredible proficiency that a railgun or missile tank is not needed. Stupid me, I thought tanks were supposed to be tanks.

And how can a module make a ship unmovable in space? That literally makes no sense at all. You mean to tell me it fires retro thrusters/turns over to fire main propulsion to achieve 0 movement speed in all directions?

There is no combat without movement. Helicopters don't stop moving to fire rockets. Aircraft don't stop to drop bombs. Tanks don't stop moving to fire their cannon. Infantry does stop to achieve the most steady platform for firing their weapon to increase accuracy as much as possible.