Maybe those teams are slightly above average as well. I don't know. I haven't looked at their extended stretches. But when a team goes on an offensive heater for 2 months at a rate only a handful of teams have ever done, that's not sustainable. Through April, the Cubs were on pace to score 961 runs, which only 21 teams have ever done since 1900. Through May, they were on pace to score 933 runs, which only 39 teams have ever done. That wasn't going to continue. And when it didn't, the Cubs stopped playing like a 100 win team and started playing like an 84 win team.
Each full season from 2017 to 2023 featured 3+ teams that won 100 games. Last year there were none and this year, unless somebody goes like 21-5, there might only be 1 in Milwaukee (and Milwaukee would have to go 15-9 to do it). So these last two years have been different from what we got used to.