Originally Posted by doublem23
I would assume they do it as a courtesy to people since the Pythagorean W-L forumla is pretty standard knowlegde amongst the baseball community and it presents the data in an easily digestable format.
It's an important distinction to make for no other reason than for someone to make an accurate critique of their success or failures based on the PECOTA system, it would be measured against actual RS/RA output since, again, that is what PECOTA actually projects. If you're judging the model against W-L, well, it kind of underlines the fact that you're out of your league.
If BP doesn't think that using the PECOTA projected RS/RA to plug into Pythagorean W/L, then they should say so, and certainly not do it themselves. Since they do it, that seems to say they think it's a legitimate thing to do.