Excitable Boy
is a metaphor
The Gym Leaders are becoming more and more shallow as characters (Seriously, go read the Bulbapedia biographies of the first Generation leaders vs. the latest).
Uh, no.
The 1st Gen Leaders have now had four Generations worth of characterization, hence why they have deeper characters. Going solely by Gen I, they barely had any characterization whatsoever, whereas the Unova Leaders have heapin' helpings of the stuff.