This.
Funnily it is what drove me out of Mobius:
the utter insanity that is to forbid PvP in any circumstances, including PvP on opposing CZ sides.
And spare me the utterly ridiculous claim every ganker used that to gank to their hearts desire in Mobius.
Fly to a battlefield, get shot. The horror.
In the days when Mobius allowed fighting in CZs there were people joining Mobius specially so they could hang around in a CZ and not pick a side until another CMDR did, then picking the opposing side just so they could attack the other CMDR. Hardly in the spirit of Mobius and nothing to do with any in-game benefit (they didn't care which side they fought for).
I agree with you, I think fighting on opposite sides in a CZ should be possible in Mobius, and I find Mobius "too safe" in some situations. But faced with the infiltration, the only thing the Mobius admins could do was forbid all PvP fighting anywhere, even in CZs. The reason it was the only thing they could do is that FD have left the provision of a PvE mode to players and
not provided the necessary admin tools. If Mobius admins are faced with two players saying "He attacked me"; "No, he started it", they have
no way to know who's telling the truth. Therefore, all they can do is enact that the situation must not arise.
I see this as FD's failure. They didn't make the obvious missing mode; they left it to players and PGs; they failed to provide PG admins with necessary tools; the failure persists to this day. I still think that eventually they'll have to address the issue with either a mode or a flag as discussed here ad-infinitum.