I don't think that's true. The current sandbox structure of the MA encourages and rewards hording, and thus we see lots of hording. This goes back to the days of Air Warrior, mind you, and not just AH. To say that hording is the "point" though is a stretch. One could reasonably argue that winning the map is the "point," and hording facilitates that, but that's a far cry from saying that hording is the point.
No, the POINT is to be able to play a war game with a LOT of other people. As soon as you get too many other people together, you're called a horde. If you don't want a "horde", there are literally a dozen other arenas people can go to... or, instead, whine.
When we up a "horde" mission, we coordinate 10-20 people on private VOX and (now and again) various other squads or trusted "pick-ups".
This includes someone taking a goon and most likely an M3. Depending on the base, we may have a ground roll of AFVs and SPAAGS. A flight of heavy bombers will lift from base A, along with a high alt escort. Once the bombers are at altitude, an NOE strike package lifts from base B.
Sometimes we win, sometimes we don't, but we have a great time. To then hear the tired b/s from people like Derpbrody 24/7 gets tedious. Of course, this is the same crowd that will bleat non-stop if you fight using the advantages of a P-51 or P-47.
Teamwork =/= Horde.
As far as what the POINT is of the main arena.... well, that's the war. People can argue this all they want, at the end of the day... you can call it a sandbox all you want... just because you
can do whatever you want, that doesn't mean that is the
point.
The day they come out with an arena called the "War Arena" or the "Base Capture" arena, that argument will have some merit.
(BTW, the above isn't directed at you (DMF) or anyone else personally... just the silliness of the "I've been playing this game for 10 years and...

" crowd that is so condescending with their blanket statements)