In my humble opinion, the desktop aio is a style thing. Let’s face it, having a tower isn’t pretty, so to combine it all into essentially a screen is worthwhile for looks alone. People don’t buy just for performance or practicality, they value sex appeal and something that makes them feel good.
It’s like saying what’s the point of a 10k rolex vs a 10 dollar casio. The casio has way more functionality right? Or clothes, or cars, or jewellery, etc etc
Back on this concept, I guess in essence you’re talking about a mini surface studio where the screen also detaches and for hopefully a much lower price tag. Actually does / can your stand have a hinge to fold flatter to aid drawing on the screen?