I am too focused on getting the exact weight of grounds out to make my recipes exactly repeatable (and pretty much essential for espresso anyway), which is so much harder to do with the majority of affordable grinders, to even entertain using a hopper. Then the retention caused by not being able to use bellows and RDT shudders
I am only going through about a kilo of espresso and a touch less than that of pour over beans a month, so its not like I am high volume.