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Yes. ThinkPad X1 Fold is also 4:3.

Kind of niche devices both though, and expensive.

On MacOS, you can install whatever you want. On iPadOS, Apple's the rentier middleman with the App Store.

If the iPad could run MacOS, I'd search for a lightweight stand (like Roost or Nexstand K1), and use my own keyboard. Closer to ultralight computing. For a 2nd monitor, I'd use another iPad with Sidecar.

They make more money the current way where people buy a MacBook on top of an iPad which has no competition.

They can make even more money from the people who will buy a MacBook, iPad and MacPad. Each for different purposes.