Please no. I don't want no touch support in macOS.
Otherwise yes, desktop operating systems are a terrible experience on touch devices.
Sounds like strictly worse version of Macbook. Might be useful for occasional work, but I expect people who would use this mode continuously just to switch to Macbook.
It’s not too uncommon for people to carry both an iPad and MacBook for example, but a 12.9” iPad that could reboot into macOS to get some work done and then drop back to iPadOS for watching movies or sketching could replace both without too much sacrifice. There’s tradeoffs, but nothing worse than what you see on PC 2-in-1’s, plus no questionable hinges to fail.
What would be the downside to other’s using it?
I get frustrated that Mac doesn’t respond to look & pinch!