There are definitely use cases. Pis have lower power consumption than NUCs. This is the main reason I went for one to run Home Assistant rather than a NUC.
I have a NAS/home server that I could put it on but I don't want my home automation going down when I tinker with it.
I have a NAS/home server that I could put it on but I don't want my home automation going down when I tinker with it.