A big drawback for progect studios and PC recorders is the noise generated from the fan in the tower. Hard disks spinning also can be picked up by mics.
I use hard disk dedicated units to avoid these issues because my entire strudio is in one room. I no longer have the flexibility of a separate envirnment for acoustic recording with sensitive mics.

Hard disk is whisper silent, and can be placed and transported anywhere. You can download to a pc later if you need more sophisticated editing, but most of the MTRs are very complete.