Except that there are a myriad of reasons why the true talent level might not be properly measured in wins in a given year. Look, I get what you're saying in that we can talk all we want about talent level and expected results, but the bottom line is wins. And, to a certain extent that is correct. But to say wins are all that matters is false. What if a team won 90 games but they had 2 middle of the order hitters who had BABIPs 15% higher than normal and those players subsequently hit better than normal with RISP? What if 2 SPs had significantly higher strand rates than normal? Or significantly fewer fly balls go for HRs than normal? Those are just a couple circumstances that can change outcomes. I think the point is that predictive models have value because they try to strip all the random events out and show what a team is likely to do in a given year. Now, because players aren't robots and some get hurt, or outperform the predictions, or underperform the predictions, or have certain outcomes that are outliers (but not repeatable) teams (and players) don't perform as predicted. That is why it's important to understand the underlying talent level. Let's use this season as an example. Everything that I've seen says the Brewers' win total will be somewhere in the high 60s. Suppose a lot of things break their way: Braun hits like it's 2010, Santana puts up a line better than 2015 Khris Davis, Nieuwenhuis gets on a hot streak that lasts all year and crushes RHP, Lucroy plays like 2014, Peralta and Garza pitch like it's 2014, and the bullpen of Knebel, Blazek, and Smith look like the NL Central version of the Royals. That team would win a lot more games than predicted. But would it realistically be sustainable? Would that be the baseline that we could expect in 2017? If you think so then you become the Brewers of 2015, who don't recognize that the team was, in reality, closer to the August/September 2014 version than the April/May/June/July 2014 version. But, if you recognize that several players all played above their true talent level, for whatever reason, you know that 'a few tweaks' to the roster won't put them into the playoffs.