Emplacements OP only vs noobs.
They are OP by their stats, thet doesn't means they can't be countered.
Still OP by map-designs, can't be fixed because the hole game shouldn't be designed by stuff never should be added in game -> british fraction.
Edit: Many people and mod-teams tried to fix the emplacement situation, it isn't possible like you see. One option was to rempace it, give brits normal mortars with range deficit and give them the option for range-buff if garrisoned in the trench-emplacemnt brits can build non-doc. Would be an easy way, relic and patch-team decided for something else.