every class can be set up to include great single target/aoe damage in the same build with room for support too
whatever tiny ounce of benefit you can min/max by using multiple builds is completely wasted by the all the time you spend swapping
The problem with a mere field swap cast time / cool down is that it does exactly what you guys said you didn't want to do: interrupt the flow of combat.
It would do this because of a few facts: Generally it's more effective to kill bosses / mini bosses with single target attacks, as opposed to AOE attacks. Also, Generally, mobs of monsters die more quickly to AoE attacks than they do to single targets. Sure there will be abberations in both sections, but that doesn't change the point. The point is that in every situation there will be an "optimum" skill set. One that focuses on something necessary for the encounter: mobility, single target damage, aoe, etc.
So, essentially for the game to have any challenge, if in field skill swaps are allowed, then you will be forcing players to switch to the "optimum" build before every zone change / boss encounter.
Threats of violence. We take these seriously and will alert the proper authorities.
Posts containing personal information about other players. This includes physical addresses, e-mail addresses, phone numbers, and inappropriate photos and/or videos.
Harassing or discriminatory language. This will not be tolerated.