You measure the output of one person while ignoring the cost they impose on their team.

If I generate 10 PRs in a day but three engineers now have to spend the next two days reviewing them, figuring out what I changed, correcting bad assumptions, debugging regressions and explaining why half of it needs to be redone, I haven’t become 10x more productive. I’ve just moved the work onto other people.

Worse, I’m consuming the time of the people who are usually the hardest to replace and whose attention is already scarce.

That’s why PR count, lines changed or features “completed” are terrible measures of productivity. You can make your own numbers look incredible while reducing the throughput of the entire team.