Delete rescue from the game.

[Rilifane]

Tanks have a lot of control over things to the point of being able to solo dungeons and normal raid bosses. Takes a while but entirely possible because their selfheal is just completely busted compared to the incoming damage. And you have easy control over keeping the party safe because the incoming damage is pitiful. A single Medica II will probably solve all your problems.

I wouldn't call it better control.
It's more that your role has just become so obsolete that any button is guaranteed to solve whatever problem you currently have since the incoming damage is so low compared to the power of a single heal.
Which is most likely also what further encouraged this attitude of "Healers are my butt wiping machine so I can have FUN!".
I genuinely wish we had less wiggle room for wiping everyone's butt and blowing on little boo boos so people finally learn that no, standing in bad is not okay and no, your healer will not be able to babysit you. Watching people just topple over if they stood in the hyperbeam from Razzy is extremely satisfying. They'll not do it a second time.
Not every mechanic has to nuke you into orbit but making unavoidable damage pitifully low and infrequent while making most avoidable damage also pitifully low is just coddling healers and giving dps even more reason to demand healers bow to their whims.

And especially the difference in reaction to Rescue vs Leap of Faith/ the Dracthyr drag & drop makes this pretty obvious.
In my entire time playing this game I had only a handful of people (and yes, I remember every single case because it was so rare) thank me for a well-times Rescue while the rest went into some sort of "I know what I'm doing/ Stop using Rescue on me -.-/ If you do that again I'll report you".
While the reaction to the other was never a negative one so far. Not a single time. It was either no reaction or, more commonly, a positive one like "good timing ty" or "woof thanks". I even had people asking mid-encounter for a Leap because they got stuck in a bad position and would only get out by taking massive damage.

If they want to change any at all, they really should improve that delay instead, not remove the button.

Yes. Exactly, don't nuke a button that has a bit of skill ceiling attached to it. Make it function instead.
I also dislike that you can't drag people safely over chasms because of how it's coded. It would give healers a lot more options and something I really like about Leap/ Drag&Drop. Someone fell into water? Or is standing on the wrong platform? Or is surrounded by fire? Or fell down a level? Or gets yeeted towards a death zone? No worries, this skill got you!
With really quick reaction you can even drag people back from getting knocked off a platform.