If you're playing in any mode besides ambush your supply depot access should be fine, but i do see your point about armor tankers. But, there was a post just above this one which added "and all active modules have refreshed". This would completely fix the idea that armor reppers could still recall because they would have to use an active module (that has a long cooldown time) before they could even begin the recall.

A repair tool should honestly be a sound requirement for vehicle users that run shield, who also want the ability to recall whenever they want. And only in certain cases are supply depots hard to find, I'm not sure if you're aware of this or not, but I'm a veteran dropship pilot, and know the locations of all the supply depots on every map when I'm flying. There is ALWAYS one at your ground spawn behind the redline, therfore making it only occasionally neccecary for a armor repair tool for a shield tanker that's in trouble.

The entire purpose of this mechanic would be to stop recalls in combat situations, and that's the most common way the recall mechanic is abused.

Serimos, one of the other things recall needs, is that you need to be unable to call a vehicle while you already have one out. Vehicle recall should not be used for trading vehicles out. The summon-a-new-one-and-then-recall is a problem.