I would immediately smash it on a door frame

I have to both agree that it’s a placement improvement in terms of ergonomics

This has to be trolling. Like, no, it's not, unless you prioritize accessing the watchface and functionally nothing else in your day-to-day life. (This is even just accounting for ergonomics – and assuming this is achiral and can be transferred easily to the right hand – not how conspicuously stupid it looks.)

• Putting it on and taking it off is more complicated because you have to slide it over your thumb and do a tiny little strap and then an even tinier strap.
• Want to hold hands with a partner? I'm sure this'll spice things up.
• What about that entire region of your palm? Who needs that all sensation when you have can a bunch of useless leather anyway?
• Continuing from the last point: inconsistency in the coverage of your palm just makes holding things weirder, especially including the phone your watch is likely talking with.
• Walking forward in a normal posture? Have fun near-inevitably smacking the shit out of your $300 smartwatch if you aren't paying attention.
• Hot, sweaty day? Good thing there's way more surface area covered by your clammy, leather watch on one of the most sensitive parts of your body.
• This genuinely looks like you'll feel the edge of the leather hit your arm whenever you move your hand in certain ways. More importantly, you'll feel the leather whenever you have your fingers curled in or hands together, and you'll likely feel skin too, so it'll just feel weird because of the constant inconsistency. It'd be so hard to become "nose blind" to because it's always changing just a little bit.
• The ergonomics of charging this thing are surely more awkward than just a straight strap. And it's even screwed in, so you can't claim you easily pop the watch out and charge like that.
• Want to hide your $300 watch under a long sleeve? Too bad, fuckass.
• Choosing to switch it to upside-down? Too bad, fuckass; it's in this one position you absolutely cannot adjust even a little.
• Trying to get actual, blue-collar work done for more than 10 seconds? Your $50 or whatever leather strap will be looking incredible by the end of it.
• As you pointed out: went to the bathroom and want to literally wash your hands? 1) Have fun wiping with this fucking thing on, and 2) as you point out, have fun washing.

Glancing to look at your watch is not that onerous even when done relatively frequently. Literally what could your day-to-day life possibly be that this is more ergonomical?

Wearing a watch at all makes you look like a dork anyway