Hey Alexander (and hi Lucille!),
Everything you’re saying makes sense and I have that frustration as well. I don’t know — maybe they are two separate paths, but maybe the things that you learn doing one inform the other the more you learn of either. Maybe it’s less like sound mixing and guitar and more like piano and guitar, different capabilities but with related skills (keeping time, reading music, understanding chord structure).
Certainly great comic book artists do life drawing, but probably with an eye less toward perfect accuracy and more towards understanding anatomy, shading, form, etc. My goal is to try to work more activities that relate to imaginative drawing into my practice – drawing from imagination yes, but also memory drawing, sketching, perspective practice, adding to my mental library. One of these days anyway.
Keep me posted and let me know if you figure anything out!