Honestly, this season's rank is probably more accurate than any previous season's rank
Wew lads, rage incoming. "Wow HateDaddy how could you!!! I get matched against 5 man premades every game as a solo player, we never have premades on our team!!! Dynamic queue sucks, I should be at least platinum!!! Arghhhh!!"
Relax little billy, I'm not really referencing dynamic queue here though I do think dynamic queue has very little influence on the majority of the player base barring outliers. No, the reason I think this season is more accurate is that the new champ select allows people to play in their two best roles as opposed to being potentially forced to play a role they simply aren't good at. I don't know about you, but I suck at ADC. In previous seasons, I think I've won 1-2 ADC games. That's 5 seasons of playing ranked.
One of the things many people benefited from is playing against someone in a role they aren't comfortable with. I could tell in previous seasons when I'd be against someone who has no idea what they were doing in top and I'd look them up and they'd be a bot lane or jungle main. There's significantly less of that this season, you're playing against someone who knows their shit every game whereas in the past, you'd be playing against that maybe 75% of the time. And that's probably why many people think the game is harder now, because it is: you're actually playing against people who main the same role as you.
I honestly am having a harder time in plat/diamond this season in top lane because I know I'm playing against people who know their shit, so it has made climbing a bit more difficult. And I think this is a big reason people are thinking the games are harder. And to me, for the first time ever in league, you're actually playing against people of your same role in almost 100% of the games you play, at the very least people who have some experience in the role. And to me, that's a much better indication of your skill than what we had in previous seasons.