Other people review edits. Review tools such as osmcha.org only allow edits to be marked as “good” or “bad” once. That means that whoever reviews your edit has to either review all 100+ POIs, spread across the world, with no local knowledge — or to review the ones they know about and then ignore the rest and mark the edit as good/bad appropriately.

Changes need to be local so that they can be reviewed by locals with local knowledge.

Added to that, the larger the bbox of an edit, the longer it takes for most review tools to load it. So you waste even more of people’s time.