I never use procreate, is that similar to vector line? With CSP you can make a dot (w/ brush), then hold shift, then make another dot while shift key is still held, this will create straight line from the first dot to the second one.

It's just the love of it really, I'll do it for hours. I usually stop when my arm or back start hurting lol. There's a lot of tools for straight lines in most drawing app/software, it should at least make it somewhat more bearable (although manual lines can look better for the "organic" aspect).