So every Lisp developer creates their own time libraries and HTML DOM libraries because it's so easy? No. This is a myth.
the lisp dialect growth is also famous, it's less the case these days because people know about it, but it existed
i'd add one thing to your point, is that lispers know how to port concepts from lang a to lang b very easily, support libs, macro layer if need be (see goroutines in clojure) so fragmentation is not as hard it was in mainstream languages (ps: even though today everybody goes into ast / transpiler to experiment)