Uh, they always were. Those that have slopes, you could access those easily with land units. And those that didn't, well, you could use air or orbital transport to get your units there. Last time I played galactic war on stable, damn AI landed his comm in one of those that was not easily accessible to land units. In fact, first time I ever played on metal planet, I chose to spawn in a trench >_< Is it any different now?
No no. they WERE deathtraps. You went into the trenches, but you did not come out, infact you never, they never heard from anyone again, that entered the trenches ever!. until they fixed the pathing Now even when pathing fixed, im haunted, scared and damaged, i cannot enter the trenches. Its simply impossible.