This is a multiplayer game people, of course there’s going to be people who don’t have any clue what they’re doing trying this new healer, it’s a matter of population. Only way to mitigate this would be to make having another healer at 70, and even then that wouldn’t guarantee you’d get someone who knows what they’re doing and not some curebot who doesn’t know how to min max dps and heals. Hell, if someone with any sense gets the job, the very first real thing they’re gonna do is go to a striking dummy and try out the job, getting a feel for it, so that should help too.

Also, try playing ranked feast if you wanna see some truly awful healers, I’ve never been so enraged at FF14 while playing as a ranged DPS in the feast.