As the title is not so accurate, it should say that almost all notes are written in Obsidian, but some note that need handwritten still being written by OneNote, after all Obsidian doesn't official support handwritten.

And the difficulty to use Self-hosted LiveSync is to set up the HTTPS(needs domain name), without which mobile devices may not able to sync. Luckily, with (free version) taiscale, we do not need to buy a domain name or have a public IP!

By default, DOSBox's window size is specified in pixels, which is a little bit too small for modern screens. It is not possible to drag and drop the window to resize it, although it is possible to use alt + Enter to switch it to full-screen mode, but for efficiency reasons it is better to resize the window.