You don't want macOS support. You want iPadOS to better differentiate itself from iOS and to offer capabilities worthy of it actually being an alternative to macOS. macOS on iPad would be kludgy and terrible. Microsoft engineered Windows 8, 8.1, 10, and 11 to all be touch-capable. Apple has done nothing of the sort with macOS outside of iOS and iPadOS. They're not about to start doing it and you wouldn't want them to do it even if they did.
A Finder-like Files app would be amazing. Terminal, multi-user accounts, sure. Do away with home screens outside of an app drawer (a la Android) or a Start Menu (a la Windows) or a Launchpad (a la macOS); they make no sense on anything that isn't the iPad mini at this point. Make it a touch-first OS. But that doesn't need to be a straight port of macOS to the iPad. That would be terrible and that's why it hasn't (and likely never will) happen.
But barring all of that for a second, what is it that you want an iPad to be able to do? If it's running macOS, then just get a Mac. If it's to be a decent companion device to either your Mac or your iPhone, the iPad isn't horrible for that now. What it's horrible at is replacing your Mac or PC.