MacOS allows me to run any software I want. It has a terminal, and allows me to run scripts. It has a shared file system and offers true multi-tasking.

You can already run some iOS apps in MacOS. I'd like a single computer where I can switch between mobile / pencil usage and desktop keyboard / mouse usage.

That's exactly what I have with a convertible Chromebook. Super Snappy ChromeOS for web browsing. It can run Android apps, or stream them from my phone. Flip it around and it's a BIG tablet. 15.6" 4k screen. Going back into computer mode I can run full blown Linux, very quickly via Crouton or virtualized slightly less quick with official Crostini. Can also do a lot of the terminal stuff directly in the ChromeOS shell. In either Linux environment I can emulate Windows via QEMU/KVM. It's as fast as native in Crouton, again a bit slower in Crostini. Lightweight,long battery life, charges over USB-C will fast charge my phone and interfaces seamlessly with the phone for tethering that doesn't use hotspot data and doing messages notifications, etc.

I'm interested on getting a chromebook. Is the linux experience really great? Which hardware would you recommend?

Sounds interesting. What model did you get? Does it have a stylus?

Most people have no idea how capable Chromebooks are. My framework Chromebook has 64G of RAM and plenty of cores to handle anything, even running macOS via KVM

Apple sells a magic keyboard for the iPad pro which also has a touchpad. The hardware is not the problem.

Other ridiculous things: The "Apple Magic Keyboard Folio" for the 10th gen iPad has a better keyboard than the iPad Pro.

I so thought you were going to say better keyboard than a 2017 MacBookPro

No... I use an iPad with Magic Keyboard case daily.

It works pretty well for things designed for keyboard and pointing device -- one of my main uses is to remote in to a Windows machine.

The main problems with this setup aren't inherent... while the track pad is quite good, the keyboard is passable at best (needs function keys and for the frequently used keys to stop semi-dying).

Pretty quickly you start to naturally switch between touching the screen, typing on the keyboard or using the trackpad, depending on what you're doing and what software you're using.

Now my wife laughs at me when I'm using a regular MacBook and try to swipe or tap the screen.