Then they OS and we're worse off then taking the deal.
As for since when- pretty much forever. The relevant one right now that comes to mind is Rychel >> Anderson + pick.
I don't agree with that at all. If they are giving us 4 first round picks, and we can turn around and flip those or go after an OS ourselves, I like our chances getting something better than that. I also like our chances at getting better from other teams if Marner is on the trade market. If we are trading a top tier piece, I don't want pieces that are two or three tiers below. I want someone in the same tier if possible, or one tier below and a gap filler (i.e. Werenski + pick, Dubois + cap + picks, etc.). I don't remember the last time someone of Marner's quality was traded for guys like Savard and Anderson (the two more valuable assets of the bunch) and the team didn't regret it. At the very least they'd need to add a couple of high end picks to make it worth our while, even if it means shipping them Ceci or something.
Also, for that particular example, Rychel was the better prospect at the time (which was 3 years ago coming off a time when he was one of the better guys on a Calder Cup winning team, so perhaps I was a bit biased from that). A lot of people thought Josh Anderson could have become a great bottom 6er or maybe a decent top 9er like he was the two years before this last one, but a lot of people expected Rychel to become what Anderson essentially did last year. Any prospect ranking I found had him above both Josh Anderson and William Karlsson at the time of the trade, and everyone thought Columbus lost because of Rychel's wanting out and having to deal from a position of weakness.
So unless you have some amazing foresight or are clairvoyant, this is just a pure hindsight argument. That sometimes happens with prospects, which is why even if they are top prospects, they are still called prospects. I mean technically Bracco could still be a total bust, while Timashov turns into a top 6 playmaker who puts up 50+ points per year. I would say a lot of people would say Bracco >> Timashov + pick right now, but that doesn't necessarily mean that is what is going to happen.
If I overrate or underrate a player on another team, I am at least going to be consistent. I'll overrate or underrate all of their players, not just their brand names
. It would be because I have either not seen them enough or value qualities differently than others. If I have followed a player quite a bit and know quite a bit about them, which I have done a lot more with AHL guys in the past 3 years, or someone like Savard who I have targeted for at least 2 years now, then I am consistent and the only discrepancy comes from how I value certain types of guys differently than some others do. I guess maybe then if they are brand name then I'll see them more often, but in this case I would have seen Rychel and Anderson about equally.