OH no not slower than a tiger! The turret exists and it does provide benifit ESPECIALLY to pathing. Being able to shoot things while navigating the shit ass pathfinding is a boon. I never said it was great but it exists. Don't play stupid. Just because it's not the OP Jackson doesn't mean it's not at a slight advantage over one's without a turret. The trait being there =\=, being the very best at it. You can use attack ground to get the turret mostly in place. Moving back and firing at a unit trying to flank you is a thing that can be done with a turret (no matter how slow it is) that can't be done without one.
the trait being there doesn't mean it's useful if it's so damn slow it has next to zero impact (which is true when you compare to a JP that has faster rotation). If your argument was sound the FF wouldn't be a sitting duck the moment something gets close like all casemate Tank destroyers (again JP, stug etc) so it has the same weakness and is not worth calling a perk.
As for your argument it can fire on retreat that's laughable, any player worth their salt will reverse awayway where any TD can return fire with a bit of micro. It's not hard and this is how you deal with diving tanks, not doing a massive U-turn while the snailpace FF turret takes a millenia to turn to the back of the tank or your Stug whatever has their gun pointing away from the enemy.
You conveniently ignore my FF MG point, this I was hoping was where you would understand your leaky logic. What "perks" as you call them are worthless if there are no solid stats to make them useful, this is why I brought up the MG's. They are useless and the FF turret in the grand scheme of things is worthless too.
If you're still not convinced I implore you to look at that firesparks video earlier in the thread, you'll see the JP snapshotting targets and rotating to targets quicker than the 440mp 155fuel firefly.