I doubt Relic would do that but if British Trenches could only be built in connected Friendly territory that'd be nice so they cant go on your cutoff and build a Trench they can use when ever they like
I suggested this because that is how it was in COH1 and it was balanced since there was risk and reward. MG's in trenches however was not a thing and I still find kinda odd but whatever.
At the minimum trenches should be more readily killable by shreks and AT guns. Currently it seems 70% of shots just miss them even from point blank.