I think MNK got it right by having thunder clap be pure utility. A bit cumbersome to use on controller, especially when you want to select another player, but regardless I like what they did with that gap closer. I agree the gap closer are just another dps button to press now. When onslaught cost gauge it was utility. I would prefer if the tanks had a variation of MNK's or RPR's gap closer where its no damage but allows you to disengage and gap close at the same time. Some examples of actions tank could have (none of these do dmg) and only have defensive or utility.

PLD (aka MNK Thunderclap):
Cover II - Rush to a target, 20 yalms (enemy), or reduce magical damage target receives by x amount (player).

WAR (aka RPR Ingress/Egress):
Onslaught - Rush to target 20 yalms. Action changes to Back Step.
Back Step - Move backwards x yalms. Action changes to Onslaught

DRK (aka NIN Shukuchi):
Voidsent - Place a void hole, 20 yalm range. Action changes to Teleport.
Teleport - Move to location of Voidsent.

GNB (aka MNK Thunderclap):
Flash Step - Rush to a target, 20 yalm (enemy), and reduce physical damage target receives by x amount (player).