So... PSP has a specific tool that's really good for my workflow, that most modern graphics programs doesn't have - it's called the "push brush" and it's a sort of dynamic clone brush.

Most "clone brushes" like... you choose the brush shape, select the sampling area, then sample an area with a click, then you can paint with that sample - but it's quite a cumbersome process that you set up each time.

PSP's "push brush" you set a shape, and then when you click, it remembers all of the exact pixels in the selected area, and as you drag, it paints with a brush that's identical to that sampled area, until you let go. If you click a fully white area, it's a white brush, if you click a black area it's a black brush, if you click an area of "textured pixels" (like all my shading) it's a brush with that texture in it.

This is super great for my work flow, I can tweak lines, remove debris, redraw small areas, and generally paint over mistakes all with the same brush, and I don't have to manually set it up or change any settings for each area, the dynamic sampling just does what I need when I need it. It lets me clean up scans much more quickly than having to change tools for each thing.

Many graphics packages have a tool that's "similar" to this, but either smudges the sampled content, or requires setting up for each sampled area, or has some other issue. I've tried a lot, and they're all just cumbersome and annoying - on the other hand, I believe PSP2022 has the tool buried in the optional tools, so... I've been meaning to try it out.