"If you can't climb solo it's because you're bad, it's not because of Dynamic queue" - actually, no.
I'll keep this tl;dr since there is already a ton of solo queue spam on the boards. If you're playing as a solo player:
- Premades have more influence over the game than solo players - the team with a better premade has a better chance of winning
- Since you have less influence over the game than you did in the past, it will be harder to climb. Not IMPOSSIBLE, just harder.
- The rank it took you 100 games to achieve last season might take you 500-1000 games to achieve this season due to your lower influence over games as a solo player
It's not about "making excuses." Dynamic queue makes the grind huge an unenjoyable for solo players compared to last season. It adds a ton more variables and randomness which makes it take a ton more games to reach your "true MMR" due to your lower influence.