Hmmm… “Nashim Datam Kalos Hem” is unrelated to intellectual capabilities. Women are just as smart as guys. The Gemara speaks of Beruriah as being intellectually beyond many Amoraim, yet holds her up as a prime example Kalus Hem.
Who ever said women are stupid? Certainly intelligent men don’t believe that. While certainly some girls are “flighty” many are not. Some guys are flighty too, just in a guy way.
Though you are right; women thrive with the “extra time”.