Death would be plenty possible.
You are entitled to your opinion but I disagree, though I will give you that shrine also had a ton of casts. And it was one of the most hated dungeons.
“Fun” is blasting. They said they were going to give healers more to do by increasing health pools, but they simply increased the damage along with it. So it isn’t really possible to wither away a player right now.
In a weird way it has made it harder for them to make a higher-level key more mechanically difficult because if everything is a one-shot at a 12, then those one-shots can’t be more one-shotty on a 19.
So if a healer is that good, they could previously just go to a higher key for more challenge. heck I did some holiday runs with some old casual friends last night, and people were getting one-shot in a 9.
The nice thing about BFA was that the one-shots came in key level by key level. On a 20 there was a new one-shot, then on a 21 there was another new one-shot, and so on. I only got up to about 25’s and 26’s but there were still new one-shots I was finding at that level. THAT was really fun for me.
So tell me my opinion is wrong, but for me personally it was much better.