I don't like it because it allows defending players to thwart an attack with no skill whatsoever. Spawn, unload supplies, exit or die, repeat until the other side's CV dies or they get fed up. I'd rather those players up planes or GVs to fight for the base properly, or spawn from a remote base and resupply like at any other base. Why should ports get special "instant resupply" treatment compared to other bases? CVs die very easily to buffs and shore batteries anyway and in my experience a CV attack is as likely to get horded as be the horder.
Usually the ports you can dry spawn LVTs are on islands quite far away from any supporting base, making the insta-resupply the only viable means of defense.
That being said, I certainly wouldn't shed a tear if this went away. The reverse of dry spawning LVTs, dropping troops, and respawning so that you have hundreds of troops running to the maproom is also ridiculously gamey.
Ports are IMO ridiculously easy to take given their importance (maps where ports are also airfields excepted, of course). They should at least have more than one VH so as a single Jabo can't disable the port's ability to defend itself. If they could defend themselves better, then perhaps those CVs could be used as the offensive weapons they should be rather than sitting around protecting the ports.