I find it funny that you're accusing Penguisn fans of asking for too much when you're giving a comically biased interpretation of the Canucks assets being given up. Hoglander is a "young winger" with 5 points in 31 games this year, is currently on a 21 game pointless streak and hasn't even started a 3x3 extension yet. Desharnais is a "replacement defensemen" yet he's a #7 D signed for $2 million with term that Vancouver is actively looking to get rid of. Yet somehow those two are positive pieces for the Penguins to be getting for Pettersson?
Last deadline, Tanev was traded to Dallas for Grushnikov and a 2nd. D-man Elias Pettersson and a 2nd is about as apples to apples as you can get for that, and it doesn't involve the Penguins taking back a cap dump D or a struggling young forward with a questionable contract. If the Penguins aren't getting at minimum EP and a 2nd for MP, why would they bother trading him to the Canucks? Especially when Vancouver has to dump a shitty contract to make MP's deal work.
Tanev was probably a bit more coveted around the league, but EP and a 2nd seems about right