Emplacements Regiment's problem is the completely broken Repair Assembly, which is able to heal an emplacement through four LeiGs barraging it constantly. Prevent the repair robots from healing emplacements and the whole thing falls apart. Which'd be good, because it's awful.
The ideal emplacement is the OKW Flak. It'll hold ground pretty effectively, but if you barrage it for a bit or throw a tank at it you can clear it out fairly easily. They force the enemy to commit a substantial force rather than a couple of units, but they won't hold a point alone against said substantial force.
I agree completely, the repair automatrons are ridiculous. At the very least their respawn rate should go up a lot because they seem to respawn almost immediately after they get killed. If you put the ISG barrage near the repairing automatrons on purpose they will still be able to respawn and repair before the barrage cooldown is over. And most of the time you won't be able to target the Assembly behind the Bofors because you have no idea where it is (FAs do not remain visible in FOW unlike the other emplacements) as the Bofors prevents scouting too deep.
And I agree with the second point as well. I was going to type that in my previous post. I'd like to see emplacements modified to be cheaper but less effective, and have the brace removed. For example basically turn the Bofors into a 360 degree bunker that does some damage to lights as well for half the price (i.e. like the 20mm Flak Emplacement), instead of the annihilator it is now. Same for the mortar pit. 17 Pounder I don't know, maybe turn it into a Pak 43.