and the OP-1 is too expensive

A lot of people are looking for that all in one box they can take anywhere, come back to the studio and dump the tracks into the daw and finish. People also want the tactile feel of knobs and pads that you can play like an instrument, get some muscle memory, play with other people, etc. Stuff you can't really do in a daw.

Circuit, Digitakt, OP-Z, the Live, this One, etc.