Absolutely! One of the research-based premises of the Academic Writing Club is the idea that writing helps you find out what you think, and even what you know. It’s difficult to move forward in your thinking if you don’t write. So, even when you don’t know what you’re going to write that day, you should write anyway. You can write messy drafts and delete them, make lists of options for your topic, debate pros and cons of various approaches, or do anything that moves you forward. Even bad writing and dead ends will get you to your goal faster than writing nothing. You will save months or even years of dissertation writing if you use this technique!
Only academics get hung up on the minutiae of title designations.
I do have to disagree with some comments that indicated that ABDs are quitters. I completed my coursework and passed my language exams, writtens, and orals but my committee wanted to stonewall my candidacy because one of the members had personal issues with me that I was not aware of. So I never quit on grad school and unfortunately, I will have to file an academic appeal because of the intent of the committee to block anything that I present as a prospectus.