I think what happens with visualization libraries is similar to what happens with things like cars or clothes, there's a lot of diversity because people have di

I think what happens with visualization libraries is similar to what happens with things like cars or clothes, there's a lot of diversity because people have different tastes, if it was only about features there would be a lot less variety, but since it's very subjective there's a lot of very similar choices with slight differences and people choose one or another mostly based on personal preference. Then for other things people will choose based on more objective factors and therefore almost everyone will reach the same conclusion, so you will get only a few choices.