The pit now functions like a mini (and much cheaper) static howitzer but people can't be bothered to put the micro in to barrage because they are so used to the pit playing itself. Same "issue" with the pak howi. Great and devistating barrage but nobody wants to put in micro anymore.
Change the garrison bonus to slightly increased barrage range when garrisoned and add increased barrage range instead of durability in the pits vet and it won't be an issue. Hell, add the pit barrage into the flares as well to make em a bit more attractive. The short auto fire lends itself to taking away the micro on defense but there ain't nothing wrong it needing barrage for offensive operations.
But straight up a non doc sexton is literally the last thing this game needs.
I don't like pits because they get countered by indirect. Literally the thing they are supposed to counter. They're also pretty easy to destroy with pretty much any weapon and you can't put them wayyy far back like howitzers.
Artillery flares on more units does not address the fact you have to get into flare throwing range to drop it and stay there long enough to fling the stick
It does not bring smoke
It has no way to gain veterancy and improve with use and preservation
It has a single cooldown timer so there is no way to ever invest more to bring more than one piece of indirect
At least putting it onto the 81mm would help, but that's hardly going to address the fundemental flaws in the UKF toolkit.
Sexton would regardless be a bad idea and wouldn't even be relevant at all in most stages of the game except very late anyway.
The idea of having commandos with arty flares intrigues me actually. Especially since they can actually get close enough to use them. Flares on the mortar sounds interesting too.