Well frankly the reason they want vector is different from people who didn’t use CSP. CSP has a special vector layers that are super useful for lineart. In Krita, there is the Calligraphy tool, and I know Wolthera was once working on making it actually useful but then the base code of something changed and the improvements had to be thrown away. But basically, Krita’s vectors are not what they’re looking for, so for them, Krita’s vector could very well not exist at all (I mean maybe not everyone, but at least a big part of them).
This is planned, btw, just, you can’t do everything at once. We need more developers 