I find that I’m limited to 2048 when using texture paint. I don’t know if this is a problem with texture paint, but with only one layer I’m guessing it’s a limit with the viewport. I can’t get anything bigger than 4k to display in viewport.
It’d be a huge help if I could get the viewport up to even 4096k. That last little bit makes a huge difference, since texture paint has to use power of 2 textures. 4k is so close, and yet so far . . .