The thing is, immobile or not it shouldnt be surviving be attacked by 2/3 units at once from different directions. It used to be able and that was a problem.
The problem is that there is limited downside to investing in 2/3 indirect fire units to counter the pit because they will continue to bleed the enemy and possibly even wipe with 0 input from the player after the pit has fallen in the same way the pit used to. Any unit that can inflict micro and bleed on the enemy with no or next to no input from you is bad news. The fact that wipes can come from them as well is just extra bad
So let's see here, it's immobile, it shouldn't be tanking as much damage as it did and now it has a smaller range, besides you paying 400 man power for 2 static smaller range mortars with abusive smoke abilities I see no more point in it to be honest, it can be easily countered now without the Brit player being able to do anything because of Brace bait tactics.
What is it good for anymore? I think the recent stats answer that question, and the answer is nothing.
There is absolutely no point in it any longer (Apart from it being OP before, and even then I was disgusted by it and only used to spam it once just for the shitz and giggles).