@missing-root I'm assuming Xournal++ is simply using its phone UI, though the apps are likely designed to be adapting to fill the whole screen. Probably from a UX perspective not as optimized as apps optimized for iPad, but then again I haven't seen anything as egregious (where the viewport was shrunk to phone-size) as what was shown in MKBHD's video on Pixel Tablet. (Then again, I don't use the proprietary apps he showed in the video.)
Krita opens normally and doesn't take too long to open (though the Android splash screen time is still a tad bit longer than most other apps on GrapheneOS). I haven't used Krita, but I do have the Lenovo USI Pen 2, which works just fine with the Pixel Tablet.
Oh, I realize what you mean now - Cromite is optimized, i.e. the UI basically looks like desktop Chromium-based browsers with the tabs and all of that.
I'm aware that FlorisBoard has a one-handed mode, which can be toggled between left and right hand sides.
I'll have to think/plan out my review of the Pixel Tablet here in forum thread form first. Eventually I'd like to do a video review, but I'll need a desktop machine that can video edit in 2024 first before that happens.