Every channel wants the same product described differently, and each one enforces its own rules asynchronously, three days after you sent the file. The fix is to hold the union of their requirements and validate before you publish, not after.
A PIM is not a nicer spreadsheet and it is not a second database. It is a place where product attributes are validated against the rules of each channel before anything is published, which is a much narrower and more useful job than the category name suggests.