iPad is still better because of the ecosystem, as I can use all my I devices together. But iPadOS is holding iPadOS back. The iPad Pro should run a hybrid of macOS and iPadOS.
Speaking of surfaces, I used to have one, and it was great! Surfaces are actually great alternatives for iPads.
The idea of a hybrid Mac and iPad OS doesn’t make much sense, in my opinion. Fundamentally, the kernel is virtually identical (especially now that Macs run on ARM), the only differences being for the differences between desktop and tablet/phone.
The userland/GUI is different, but they’re designed for drastically different scenarios. macOS is designed for use with keyboard and mouse (and the Touch Bar was intended to bring multitouch toolbars, sliders, etc. to the macOS without fundamentally changing the macOS experience). iPadOS is designed for touch first, even if it can be used with mouse and keyboard. iPadOS runs on devices like the iPad, iPad mini, iPad Air, and iPad Pro. macOS runs on machines like the MacBook Air, MacBook Pro, iMac, Mac mini, and Mac Pro. iPadOS is intended to rethink the old interactions that were grafted on top of the desktop environment and to rethink the desktop environment itself. macOS evolved from a very basic desktop environment, which was designed to help office workers who were complete novices in computers learn how to use them.
What would a hybrid even look like? Touch first or keyboard and mouse first? The former would look a lot more like iPadOS, while the latter is Windows in tablet mode. Desktop or app centric? Simplified window management or full-blown window management? These are binary choices, it doesn’t really make sense to try to find a halfway point between them, case in point tablet mode on a Surface. Despite making concessions for touch screens, it’s very clearly mouse-and-keyboard-centric, desktop, full-blown window management Windows.