I never take mossies to the strats anyway because every time I do I either get killed by the ack or jumped by a fighter....
You are doing it wrong then.
The main difference between Lancs and Mossie is that they are simply much easier to intercept. Yes, if a fighter awaits you over the starts you are in deep dodo.
But the high speed at alt of the Mossie makes that chance quite small, as there are actually few players patrolling the strats just in case. Most strat interceptors only take off when a bomber is spotted. And while that may still be in time to catch a Lanc before it drops, it's definitely too late to get a Mossie cruising ~330 mph at 27k. (Yes... you do not fly the unarmed Moss to the strats at only 12k, unless you
want to get shot down)
I may also add that the loadout of the Mossie is superior to the Ar-234 in terms of factory busting since the 4k bombs was changed from GP to HC. The Arado is still much faster, but also higher perked.