Probably because if you aren't paying that much attention to Lisp software, the almost 40 years of writing about Common Lisp will surface more so than the code and their authors. And a lot of code (millions of lines) isn't open and a lot is probably lost to time. Though it seems like you know about a handful of the current era superstars, yet you're forgetting or don't know about other superstars. And there's a long tail of less prolific developers. But sure, just comparing the open source stuff in Quicklisp, there's only about 2500 projects (vs 335k projects on PyPI), and the frequency of new stuff regardless of whether it shows up or not in quicklisp is slow enough that you could follow https://twitter.com/NewLispRepos/ and not have your timeline overwhelmed.