Personally?
They cost money.
When I've tried them, they were awkward.
I'm cheap and too lazy/cheap to learn to use them.
Well,
there's an honest answer.
I suspect that's satire.
No!
It is 100% honest.
Somewhere I'll find an open style one cheap. And mount it on
a MKII.
Too many people who aren't chasing status or the next new thing have
settled onto them and endorse them.
Well remember learning to use a rifle scope, later one on a SBH.
Sucked. Was much more confident with opens despite crappy vision.
Over time, learned scopes. (Never liked the pistol scope)
See dots as the same process.