Relic said, they wanted the FireFly to act as a "sniper"! the thing is, the Scottish guy in the UKF army is also a "sniper"! It makes me think they thought whatever in UKF is called "sniper" should have a God awful rate of fire.
But apart from that FF is really not reliable compared to other TDs in the game for its cost. Yes, it can deal a huge amount of damage with Tulips, but that's not how it should be like! that doesn't let it be a reliable, dedicated tank destroyer like Jackson, SU85, or JP4. I love it how almost any tank in the game can find it out of position and circle around it and kill it. It reminds me of ISU
I think it needs some adjustment so that you're able to use it similar to how you use all the TDs with more viable rate of fire.
And about Tulips, UKF seem to be such munition dependent faction and the Tulip's price, makes it very risky any time you use it. Just for ex. 3 times you use the ability is equal to 1 Air Supremacy
Please rework the FireFly