I've noticed a recent batch of questions about pdfs and producing them -- though not necessarily for reading as ebooks.
Of course, many ebooks are sourced originally as MSWORD, and many PDFs are not intended to be read as ebooks on mobile devices.
This raises the question of whether these kinds of questions are ontopic https://ebooks.stackexchange.com/help/on-topic
Should a question about PDF and MS Word be considered ontopic ONLY if the result is a publishable ebook?
I think the on-topic list should acknowledge this fact somehow -- especially because some kinds of commercial publishing (i.e., press releases, technical manuals), don't necessarily result in a commercially published ebook.
I was answering a question about whether PDFs are considered an ebook format and I realized that there are so many PDF readers for mobile devices (and many MS Word readers too) that you could make the argument that all questions about MS Word and PDF are relevant because they could conceivably be read by mobile apps. I'm fairly neutral about that -- though I don't want to exclude too much.
At minimum, IMHO Ebooks SE should explicitly include any questions about converting from MSWord to any of the ebook formats. Also, any PDF questions about ebooks intended for commercial sale would be on-topic. Whether it should be allowed beyond that -- I don't know.
Super User already receives a fair number of questions about MS Word https://superuser.com/questions/tagged/microsoft-word
Writing SE allows questions about writing tools https://writers.stackexchange.com/help/on-topic , but actually they receive very few questions on the matter. they have more questions about general style and formatting and general questions about tools