i agree that the overwhelming majority of Abyssos problems were on tanks that did not know their kits, but plenty of bad healers all around too, people that didn't know how to handle tank busters with dots, or the high healing needed in mechs like Dominion where a damage up is applied after each raidwide. it all circles to roles not being properly played by their players, and instead of wanting to learn, it's easier to simply abandon and ask for change.
also i'm gonna be honest J-Waves and the likes is just changing the glare button for medica. i looove these mechanics but it's not like they're amazing fight design either. they -do- need oGCD planning but so does everything else. like, by experience, anything that is a tumult-like is too much for the usual healer, this happened in p10s too and that one doesn't hit as hard