Given the ability for trenches and bunkers to be reserved, what mechanism is going to prevent players from intentionally building disruptive trenches and bunkers to grief, then reserving them so they cannot be removed? That is my only concern with the new reservation system for trenches.
Good question. Even if a Trench is reserved, it can still be destroyed by conventional means like HE Grenades just like before. So from that standpoint its no worse than before.
However, since Trenches can't be rammed anymore that does introduce a possible new avenue for griefing. Please test things out in dev branch and then post your feedback so we can try to accommodate any specific scenarios we might have missed.
As a side note, Trench reservations are shared with your Squad for collaboration purposes.