Feel like this is something I read a long time ago but I can't remember if it's accurate or not. Do players that play in the postseason or go further in the postseason get any sort of extra development? I feel like this is something that should be true especially for a young player that's going deep into the playoffs at the Major League level, it should have some sort of positive impact. Especially if we are trying to mirror real life, young players that get those postseason games definitely get something out of the experience that they carry with them for their career

Yes, they do see progression. Another reason why I feel it is important to field competitive teams in the minors.

My hunch is yes, but probably just a fraction of a point of ratings development.

You used to be able to see a player's true ratings before they fixed the bug. Every single player I looked at across multiple leagues never hit their true ceiling on coachable ratings (most got within a point in the non coachable ratings). Most players fell 2-6 points short.

Just speculating here but - I'd guess that in order for a player to reach his true ceiling he'd have to be in the ML on day one with ML coaches and go a ways into the playoffs at the ML level his first four season. That's the only reason I can think of why nobody could hit their true ceiling.

OTOH, since the low end seemed to be around 5 points short, you're only losing 4 points (6-2) by not maximizing player your development. In other words, the difference between getting the most out of development vs. doing the bare minimum seems to be ~4 ratings points.