It has. Since the "childhood friend" archetype character is the most used for non-FMC characters, its also the character most used to lose. Thats exactly why the trope about the childhood friend always losing is so well-known, even tho there are other "always lose" characters like girls with glasses, blondes or girls with the biggest boobs.usually, childhood friends only lose because they aren't the main girl... it has nothing to do with them actually being childhood friends....
No shit, Sherlock.In fact, when the childhood friend is the main girl, they often win...
Childhood friends as FMC isnt the usual, so there cant be "quite a lot" of them as winners.and among the trope of winners, childhood friends actually win quite a lot...