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Regen shield is far from useless, it can help you recover quickly enough to survive another firefight.
I could maybe see this being true in ctf or koth where you need to hold a position, but aside from that you could just resign to safety and wait for recharge. and even though that is a plus to regen, that's pretty much where the benefits end. You just can't put enough value on added mobility, which the TP and JP provide.