Robbing gap closers of damage makes the game even less fun.

[Daeriion_Aeradiir]

They become completely thoughless because you'll always have them available when you need them. Planning gap closers wasn't a big ask.
Might as well not have an ability there if it's implemented like this.

And currently they're thoughtless 'fire and forget in your burst window' in 99.9% of situations, so tomato tomato, not much has changed with them going into DT on the cognitive front. They're thoughtless now and they'll be thoughtless in DT. However, you know what they could do with the new gap closers that would create skill expression that is impossible to achieve due to the limitations of the current gapclosers requiring an enemy target due to dealing damage?

Warping to allies.

Seriously, Thunderclap is the best gapcloser in the game bar none by sheer virtue of the great plays you can make with it for uptime and movement during mechanics. I'd delete potency from gapclosers a thousand times over if it meant all melee/tanks got access to a thunderclap-clone skill.