on MacOS there’s an application, called Preview, which covers 90% of file operation needs of an average user. There’s no equivalent on WIndows, it’s a gap that has never been filled.
The most used features are pdf editing, merging, picking pages and copying to another document, Same for graphics formats etc. Adding notes, highlighting, signatures etc.
MyCo is a file manager, so it’s a little bit different, but, given that has some extra abilities, for example right in the pdf direction, it wouldn’t be bad if it could at least allow pdf merging and similar operations.