People split PDFs because something refuses the whole file
An email attachment cap. A government portal that stops at 5 MB. A form that will not take more than 2. That is the reason, almost every time, and it is a size problem rather than a page-count problem.
Every other splitter offers 'every 10 pages' as the answer. That is a proxy, and a bad one, because pages are not the same size. Ten pages of text might be 200 KB; ten scanned pages might be 40 MB. Splitting by count either produces parts that are still too large, or far more parts than you needed.
Choose “To fit a size”, give the limit, and each page is measured individually before parts are packed greedily up to that budget. You get the fewest parts that all fit.