If we talk about matching up with elo, I think it would be better if we wouldn't reset the ladders every month or so. I remember before the rank change when the good players usually sat on rank 100 and above, whereas the new players would constantly struggle to even reach a positive win-ratio.
As an intermediate player during my earlier belts, I think I still had quite a relevant rank to where my skill level was at the moment. Sure, there will always be players who destabilize the ranking-system by not playing seriously, farming, and what not. But tell me of a game where you've seen a rank-to-skill accuracy of a 100% throughout all ranks.