I do agree that F3 should be disabled in the DA.
However, F3 view offers no advantage in a 1v1 fight for anyone with enough cockpit-only view experience. A single bandit is easy to track, even when they momentarily can't be seen.
In furball lake, it might offer some marginal SA advantage, but I would argue that anyone with enough cockpit-view only flight time should still have no trouble compared to a newer player using F3 mode constantly.
In essence, the people using F3 in the DA are only hurting their own learning of the game, and are not gaining significant advantage over any veterans of using proper cockpit SA.
Just my opinion.