@VaultTheHavoc
https://answers.ea.com/t5/News-Game-Updates/The-Old-Ways-Event-Patch-notes/m-p/8924896#M1486
Everything they say there are totally valid argument. You are just arguing against yourself, claiming Respawn says something and then saying thats invalid because this or that.
Yes they mention that the game is designed to be a team game which is a totally legit argument. If solo was a thing in this game, ALL balancing of the game would be totally off for solos vs 3-teams; round timers, map size, loot spawn and ofc legend balancing. Legends like Lifeline would be considerably weaker in solos and legends like Pathfinder would be considerably stronger etc etc..
So bottom line is that IF they added solo as a regular mode, maybe even with ranked, then they would have to put alot of time and effort into balancing that mode too. Its much better they try to make the best team based BR than trying to be good at everything. League of legends COULD probably be a decent story driven PvE game, like Diablo 3 too, if RIOT put all their resources into that, but you probably understand why its not possible to please everyone.