A summary of healer issues

[Sebazy]

Though that is only part of it - FFXIV fights have mostly always been this way, but it wasn't AS much of a problem in the past.

That's not entirely true. Don't forget that crits on tanks used to be a thing, as well as a lot more bosses having secondary non telegraphed tank busters that were on their own cooldown independent of anything else the boss was doing (Although in some cases would effectively queue to land alongside a cast ability).