That’s how Sparks works with FF and more people should learn about it. Why would a Sparks waste their valuable self-healing kit when they can double-tap you to full? It’s frustrating in a pub where they CAN’T kill you and get you up full and you just sit in a corner at 10hp for half a minute whining at the Sparks to heal you.
FF has been on in the competitive setting for ages now, have you never watched how the medics perform in those games? If you need to save a cooldown you just kill your teammate and revive them to full.
Honestly, people just need to adjust to this. Use call outs, say when you’re about to bombard an area with a strike, think about your positioning. You know, all those things you’re meant to do but don’t in a pub because there’s zero repercussions for choosing not to.