editing my fantasy novel | rewriting chapters and making structural changes | a writing vlog 

Because page count is entirely dependent on the layout settings of your document in our contemporary world. The same 5000 words (≈ a chapter) can fill a veeeeery varying page count with different settings. In some remaining academic settings, where you've got a set font + spacing + marginal standard for everyone to use, you can still see requirements given as sheets/folio/slips etc. and that's something that was done back when typewriter slips were used. With a specific machine you only had so many adjustments to make to the marginals and spacing of your text, so the correlation between word count and page count was more accurate.

@@jasminv8653 I always had a feeling there was something standard used, eg times new roman 12, and then whatever you want to change it to, is a different thing

Me too! Im trying very hard to avoid letting any of that get into the final draft 😂