Please don't take my comments out of context, then set them up as a strawman. The entire quote was (Tomexe excluded text in bold):
The AAAV uniquely meets an implausible requirement -- a surface raid against a litoral so heavily defended that close approach by phibs is inadvisable, but which at the same time has such a porous enemy ground troop deployment that the raid force can drive around at will once it reaches the beach. Now, I'm just a poor dumb grunt, but in all but the most exceptional of circumstances, those seem like two mutually exclusive conditions...
The problem I see with the AAAV is not so much that it is a nifty toy, but that it is still just a relatively lightly armored vehicle, expected to roam the enemy hinterland at will without any logistical support other than what it can carry, what can be carried by logistics variants, or that can be brought in by air. This is a fantasy of the highest order, and it's going to get troops killed in practical application.
BTW, it's pretty obvious that you don't know much about small craft operations if you think large formation of them can maneuver for any distance parallel to shore or that there won't be significant pause on the beach to reorganize after landfall. But don't worry...this fantasy is apparently held by many people supoosedly more expert than you or I, at much higher paygrades.