Hair cut actually seems like it would be more complex than dental surgery. You only have about 32 teeth, they are large, and they shouldn't move around much. Compare that to 100,000 extremely thin strands of hair in varying length moving about all willy-nilly.
Yes, it is extremely impressive, especially considering it was made by one guying trying to come up with a hair cutting solution during the pandemic. Like you said in regards to trimming, more work would need to go into it to fully replace a hair stylist, and I was just pointing out that weirdly enough that might be more difficult than the dental surgery robot.
