The reality is that languages are born with a single creator, and spend their adolescence growing under that creator's care, but achieve maturity once they can demonstrate that they can function without such a single point of failure as a BDFL.
But C++ is Stroustrup, Java is Gosling, C is K&R, JavaScript is Eich. Most successful languages kept their internal consistency by being designed by a single person. Historically, these single persons also had mustaches.
Yes, eventually all of those graduated to a design-by-committee approach, but that happened much later. But yes, in that sense, Python is just following the path set by others.
C++ wasn't designed by Stroustrup alone. It's based on C's design.
Sure sometimes you have cleared leaders (see also Perl/Larry Wall) but having a larger group has benefits to see more edge cases (with the risk of committee issues)
So, all around 20 to 30 years ago.