Exactly.
That's why I say "High level 5e is objectively broken because casters have too many spell slots and this reduces the number of playstyles that high levels can run to 2 because 1)the DM has to burn down a lot of spells slots in unrealistic ways in order to create a challenge and 2) in order to burn though all those spell slots, he DM must make the caster look at all their complex spells and lengthen their turn dramatically"
I said this over and over.
Then people say "High level is fine. I run it."
Then when you learn their player turns and monster turns take

foooooooooooeeevvveeeeer

and the DM is always metagaming way to sneak in 8 combats to burn through 16 spell slots on 2-3 casters each

everydaaaaaaaaay
I say "Do you realize that very long turns and the need to metagame in filler fights on archmages and high priests all the time might cause people to not play high levels?"
"Well that's D&D. Go play some other game. It's annoying but I like it. You can't please everyone."