I'm pretty sure most players want to kill their opponent at full strength and be at their full strength when they start a round.
I don't get any satisfaction out of killing my opponent at low health, with their key abilities on cooldown and/or spawning right next to them.
The time that it takes to heal in town or rejoin the game is negligible in comparison to the duration of your average round. The rejoining is indeed an advantage for skills like Spirit Vessel or Wrath of the Berserker, but without the rejoining it will just lead to a) costing more time because players wait for their CDs to reset before saying go or b) in your weird dueling format, players switching to full tank/full regen until their CDs are reset.
I also see little benefit in gear and skill swapping. It's just an excuse for having bad, one-dimensional gear or is used to correct your mistakes when you realize that you started the round with wrong gear and/or skills.
Your style plays better for you now because most of your opponents don't gear and skill swap. This is a competitive environment and season 1 showed what happens if both players start swapping.
Duels are already too long and often stalematish right now. This would prolong the duels even further because players will run away and reset with regen, HP bonus and tank gear every time they are in danger. It would obviously shift powers a lot, favoring the player with higher mobility.
Even with no WotB, wanna know how Barb vs. WD would play out?
Barb runs in defensive gear for 20s, attacks with 2h in his 7s of Ignore Pain. WD does the opposite, when Barb pops Ignore Pain the WD switches to full defensive and then goes to full offense when Ignore Pain runs out.
Again, I fail to see the benefit of this, it's just annoying. Most players don't want that but are forced to swap if their opponent swaps.
Cheers,