Since the last poll, I regularly hit gold and even got to diamond once with a silly deck. Although the season just gone I was only silver. The only real difference between me hitting one tier from another that I’ve noticed is the amount of time/matches I played. Last season I didn’t play any games for about 3 out of the 4 weeks. The time I hit diamond I played 1 in every 2 days for about 3/4 games. I’ll probably hit gold again this season because I’ve set myself a restriction challenge in terms of which cards I can use, so hopefully I’ll be more engaged this season.
Personally, I think most people who can regularly play the game can hit diamond, if they have the time and want to. The only correlation that I think is there, is that people in diamond and S-rank will always be skilled/knowledgeable players, whereas below that is more of a mix bag where you can face off against people who are clearly better than their rank but aren’t trying or wanting to climb or just using meme/fun decks.