That 'style' though only came about less than a year ago, and prior to that there so much more variance (still a jungler, solo mid/top, duo bot) in what each role was doing and where, etc etc
And while you think that may be the bee's knees (at the highest level of play it's proven to be the most successful) at a pub level in a majority of games I would say are 'ruined' by people feeling the need to pigeon hole themselves into that. Even at high level, stuff like ranged carry mid, or the 'dedicated support' taking a solo crops up from time to time but rarely at the end of tournaments, but no one at lower levels wants to diverge from the standard, and tbh, it sucks.