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It didn't fit any better in 1999 than it does now and it wasn't a good teaching tool because it didn't match reality at all but was presented as if it did. Definitely caused more confusion than learning.

The book has an extensive section on history.

I claim that by 1981, the OSI Model was already obsolete and that it didn't fit well, that was not a good teaching tool, that it has done more to beffudle than enlighten students. The problem being is that if you learned according to the modle, you are not aware of what you misundertood.

When I was first exposed to the OSI model in the late 80s, it wasn't very good then either.

It's not really meant to explain http2? But it still very much applies to how an http2 user gets data from a server..