Whilst the single level Undo is definitely a thing (Photoshop didn’t get it until v5!) paint apps on Macintosh got much, much better than MacPaint over the course of the 1990s. The one I use, Deneba artWORKS, allows mixing vector and pixels, has layers, dither fills, and more: https://blog.gingerbeardman.com/2021/07/30/playdate-1-bit-illustration-postmortem/
I also helped Lucas out with my solution to running Macintosh on iPad. You can read about that here: https://blog.gingerbeardman.com/2021/04/17/turning-an-ipad-pro-into-the-ultimate-classic-macintosh/