I think a lot of people would disagree with the assessment that LA Matchmaking doesn't have a matchmaking problem, especially in Gold. Especially Especially in Gold IV.
The reason I know that is looking at the Top 100 the overwhelming majority of players have a win rate of 75% or higher. Also with Seasonal, the matchmaking is really bad in the first week and right now that is unacceptable since its not the 1st season, which means the 1st season results did not factor in to the new season in any meaningful way.
With bots, the minimum Win Rate you can have is 25%. This is math, there's no emotions here. So if the high end folk, and this even gets in to the top 200+ players, are all above 60% then that means a ton of people with win rates of below 40% are getting matched with them frequently.
Now I get it, people who have been playing for 4+ years or who are spending a ton of money each month are going to have a significant advantage over others. In fact, for the spenders, it's a big part of why they spend. The satisfaction of beating other players. That doesn't change the fact that the matchmaking isn't balanced well. Anyone with a average win rate of below 50% shouldn't be getting matched against anyone with a average win rate above 70% but it DOES happen frequently.
IF this was truly about competitive matchmaking that was a challenge for all players, it would be extremely EXTREMELY rare to get a win rate above 65% which is a 2 to 1 ratio essentially of wins to losses. Thats not whats going on, because A. if that was the case, big spenders wouldn't be getting as many easy wins and B. the wait times for matchup would be much longer for the better accounts, regardless of why they're better.
That's not even getting into the RNG of it, especially with rank 6 Polymorph and Relics.
Here, I'll simplify because that's a lot I wrote: HYPOTHETICALLY, if all players in the Top 100 were ONLY matched against other players in the Top 100, would the majority of them still have a Win Rate above 70%? The answer is NO because that's mathmatically impossible.