The reason that many players on NA don't care about wins is because many have become pessimistic about riot's direction with the game, and only play because of sunk costs, familiarity, and nostalgia.
They keep making things worse (from an NA prospective), ignoring feedback, and generally redesigning the game into a state that it's not only a different game, but fundamentally a different appeal under the same title by phasing out the old game. It's like if instead of releasing a new version of CoD every 2-3 years, some guys in black suits came forced their way into your house, took your disk and replaced it with the new version which completely changes significant aspects of the game's fundamental design like pacing, learning curve, and secondary systems.
Ok CoD is probably a bad example.
Point is, league of legends use to reign supreme over part of the MOBA market, but the game has shifted so much that they've created a vacancy in the market, but competitors tend to mimic them rather than make up for them. It doesn't help that learning a new MOBA is a long process, so people tend to not invest the necessary time to really swap games. Riot took their existing players (mostly NA) for granted and decided that they need to appeal to a "wider audience" while doing so at the expensive of, but most of the time simply neglecting, their existing audience.
If they didn't try to appeal to the lowest common denominator, then they wouldn't make the mistake of trying so fucking hard (seriously years of progressive changes to try and make this shit happen) to redefine the support role to be appealing to players of other roles.
The support role filled a niche play style that some players refused to touch and some played exclusively, but they don't seem to understand that opening the support role to other players means that you're pushing the existing niche portion of the audience out of the role, because both can't exist when you do shit like add a ward cap or release thresh and do literally nothing about his overly impactful kit relative to other supports.