I once read an article [1] that argued Lisp did not reach the same level of industrial popularity as other programming languages due to the fact that Lisp enables you to program in a lot of different ways for different reasons. I'm admittedly not very familiar with Lisp, and I don't know if I fully agree with the article, but it made me wonder if ease-of-collaboration can be considered a useful perk for languages/frameworks.
You could make a fair argument that ease of collaboration is the useful perk for the kinds of framework we’re discussing here.
In most cases, these frameworks don’t offer radical new functionality, but they do provide a focal point for developers interested in similar functionality.
By the time Django finally broke through, PHP (with a good-enough mini-framework baked in) already dominated Python for web development, and the fragmentation of the Python world was arguably a contributing factor. Others adopted a third language because of a single mindshare-heavy framework, Rails.
mod_python didnt come around until 2000. by then php4 was already out