Every other app treating the tablet like a mouse is the normal and desired behaviour. As others said, Wacom tablets on linux should just be plug and play. I literally just plug it in, open krita and start drawing. Big difference from the literally hours I spent on macOS trying to find the right drivers for this older model.

I would add that I did have some issues with the Flatpak version of Krita where the tablet didn't draw as expected. Replacing it with the standard deb from apt repositories fixed that though.