I'm starting to think new players and low elo in general have the most fun in this game overall.

I mean think about it:

• No stress to win as most of them play casually and don't care about Ranked (yet).
• They're not toxic assholes to each other and muting the smurfs is pretty easy which is the only downside to being a "Noob" that you propably don't have that MOBA thicc skin yet seeing how "Hardcore" this game is to some people, no matter which mode.
• They get to discover all this new stuff and get to play a new, well designed by standard champions with extremely well emphasized thematics. Things we had a long time ago but on a lower quality scale. Eh...old Sion anyone? Old Warwick?
• Items. Duh.
• They don't know the META and some don't know what META even is. So they get to play whatever they want and have fun doing so. Because new players don't really know that Bot lane is out of control for example so they pick whatever they like. Sometimes they don't even play the traditional role champions, so they'll go like Graves Mid or something.
• High morale to work together as the game teaches you well that you're supposted to work as a team and new players don't argue with that.

Meanwhile, in Mid-High tier elos:

• Assholes everywhere because people take the game more seriously as your Rank rises.
• Meta warps the game to only a few playstyles and matchups including strategies.
• High stress due to the lack of margin for error allowed because your entire team will get blown up.
• Many trolls. In lower elos, people don't flame nor care enough to troll. I know this doesn't apply to everyone and there's propably someone who gets unlucky a lot but this happens in every elo. It just seems to happen more often in Platinum+ because people get angry at each other easier and give up.
• People's game knowledge often conflicts with each other and it causes conflict within the team itself and breaks it apart, resulting in low morale and people becoming solo players, dying alone without working with the team.

I don't know if this is something Riot recognizes or not but i hope they do.