I believe an awful lot of it is due to allowing third party sellers.

And I think a lot of it is third party sellers uploading their catalogs without trying to sanely de-dupe it vs what's already there. And Amazon certainly doesn't help in how they organize their search results. Please give me a simple size and quantity separate from the description. So often I have to open up a bunch of entries because the description is long enough to push that off the summary you see on the search page.

I also think there are a lot of entries on there where the main objective is to get accidentally grabbed when the main supplier is out of stock.