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Because people enjoy making things.

Your question makes it sound like there's a central planning authority on the state of CSS frameworks.

Of course there is no central planning authority, but there is a 'market' of sorts, that seems to have become saturated with many things that do the same thing.

CSS grids seem to fall into that large category of "things software developers" love to make.

Cf. blog engines, URL shorteners, IRC bots, testing frameworks, pretty printers. The list goes on and on.

Good point, among certain communities, testing frameworks is a very good example!

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