I have to agree, while some things are undeniably better with the new UI like the sticky save post bar, some other choices I find rather odd.
When the new UI released I remember reading that the aim was to make it more compact, yet there’s so much padding with the new UI that as soon as you’re 3 levels deep nothing fits on the screen anymore.
I have to admit liked the simplicity of the old ACF UI, everything could be done very quickly from the keyboard without the hassle of having to click through tabs.