Another aspect of impracticality of such watch is akward positioning of your wrist - just imaging you use one and hold both probes and look at the watch display.
I think it's better than silly "handheld" multimeters, they are stupid - just try hold it in one hand and manipulate two probes. Realistically, nobody does that. You set the multimeter down somewhere on it's stand.
With the watch, one hand has a test lead and you can look at the probe and display? It's still better than pen style DMM's, display at a right angle to the probe is not great.
there is a reason why 3D artists, and electronics engineers need to work together.
The industry is scared to come up with a different form factor, look at ergonomics etc. We should celebrate over 40 years of the "bar of soap" format for portable multimeters. I'm sick of them falling over and the stand collapsing. A few manufacturers have tried different form factors, at least they try go outside the box.
So a watch format may not be practical due to HV but it's at least thinking creatively. I wonder what Steve Jobs would do with it lol.
I'm sick of them falling over and the stand collapsing.
I much prefer the older style with straight sides and minimal rounding of corners for the reason you give; they do not tip over as easy. Some modern instruments copy the style of smartphones to the point of being useless.
I wonder what Steve Jobs would do with it lol.
You would had to use your fingers as probes
I wonder what Steve Jobs would do with it lol.
You would had to use your fingers as probes 
If you electrocute yourself, then you are finger probing wrong.