Biggest error is that AV is a bg which includes a boss that doesnt go very well with gear scaling.
BLZ never cared much about PvP balance but one could at least argue they spent 5 mins to scale boss hp & damage properly each new tier within an xpac.
AV at launch of a new xpac is miles away from the end, hell, now you can zerg him down with 3 towers down without breaing a sweat. Put on some pve tanking gear and you can ignore towers with decent healers.
Only reason some players even cap a tower is the increase in honor.