Maybe it’s just me, but it seems like the cause for tdm getting campier is from the “new” rank system. Since you have to pay GP to play, it seem now people have something immediate to lose. On one hand it’s nice because often, I’ve found people are generally less wasteful with their lives, but then on the other hand that sometimes means more camping. It’s not always idle camping, but sometimes it is and that sucks (especially when the other team is up 6 lives and expects you to come to them).
I think more people in the mid-upper ranks are starting to figure out how to play/coordinate without being an actual stack, making it harder to push another team’s position without back up/team effort. That usually causes some lulls in the action to be able to regroup and push.
For better or worse, my experience playing this op has often reminded me of warzone, with a few extra lives.