Almost every "normal" job has regular performance reviews where individual contributions, not collective outcomes, are reviewed and used as a sole input for raises, promotions, and firings. If you can't sufficiently document what you personally did, you might've as well not done anything at all.
Yes, that's true, but it is still generally accepted that a completed project is a result of some collective effort where people of varying degree of seniority and ability contribute. There is also not a singular event of a project being completed with a list of heroes/geniuses making it happen, but rather a whole lifecycle of gradual development, maintenance and going out of relevance with contributors coming and going.
I can imagine mathematics of the future being more like that rather than history of discoveries with dates and names