When I started playing back in 2013, supports were treated like absolute fucking garbage, far worse than they are right now, and right now they are treated worse than child molesters in prison. In the instances where someone who hated supports would not speak up fast enough and get delegated to the support (because we had to call our roles back then), they would flip their unholy shit go berserk, and ruin the match out of sheer spite. I had dozens, HUNDREDS of games in my first year sabotaged because of that culture and mentality. You still see those kinds of people floating around, but it's much more rare these days.
I started going support in the vague half-promise of having a normal game, and I got to see first hand the kind of shit supports had to deal with, and why, by extension, the role was so grossly unpopular while being extremely vital. The reason why systems like Teambuilder and Clash failed so miserably and continue to do so is because of the unpopularity of the role, and the way the rest of the community, high on pentakills, treat supports like second class citizens or inherently inferior players, alienating any possible support players. A few years ago, if you went anything but support, you expected to wait for at least five minutes in a queue compared to less than one second for supports. I've even encountered people who were still waiting in the lobby for a match to start after I was able to play a game and re-enter the lobby after it was over. It was BAD.
Vestiges of this mentality continues today. It doesn't matter how much you know about the game, people will disregard anything you have to say if you have played support even once, assuming that any ranking or skill you have has been mooched off of better players. Even so much as uttering a single syllable as a support is enough to set off some players in a fit of face-ripping rage. And god forbid you have kills; may as well be a black person walking around with money in pre-Jim Crow America.
I play support because the support role ends up being the most versatile and needed role in the game, and I have long-since learned how to read team compositions and what our and the enemy's strengths and weaknesses are. Anybody can get kills, but supports more often than not are the ONLY people obligated to help their team; otherwise it's a 1v9 culture where every player goes miles out of their way to screw over their own teammates so they can pick up all the pentakills so the womenfolk will want to touch their penis.