Vaneks lack of respect is self made, his reputation for being lazy has been around since his Buffalo days. There's also plenty of other reasons he's not locked up somewhere. He's a passenger, he needs linemates to draw defenders away and to set him up. Last year among NHL regulars only Riberio started more shifts in the o-zone. It's the kind of deployment that maximizes his offense but I'd rather see a young guy in that role. He also struggles defensively usually giving up more than he creates.
He is still elite in front of the net, has a great stick, great at powerplay and shootout but is really the kind of player a contending team would use in specialized deployment, not us. These minutes should be going to Boeser/Virts/Goldy, not a 33 year old. I think most people would have been fine with 1 of Gagner or Vanek, not both. At this rate I'd be happy with Vanek only since it's just a 1 year.
To further your reply to the OP,
You have to think of a team as an ecosystem, every new organism you introduce brings ant-bodies and bacteria, both of which are contagious. You have to bring in the right antibodies to cure any infections but you also need to only bring in bacteria you already have the antibodies to cure.
Vanek can, with help can contribute offence (antibody) but he also brings lazy, half-a$$ed "Meh...I don't care either way" bacteria.
That is one of the more feared diseases in the NHL, people want to keep it as far away from their teams as possible.
He was a bad choice to bring here, for Boesser to have to watch his ice time taken by a player who didn't earn it, doesn't appreciate it, and plays in a manner that makes it clear he isn't trying hard to keep it is going to lead to resentment,
And Boesser would be 100% justified in thinking something isn't right here,
Neither Vanek, nor Errikson, or even Gagner deserves to be above Boesser on the depth chart, yet he sits, As an American college player, I don't know why he didn't finish his degree then sign wherever he wanted for mega bucks, I'm thinking he may regret trusting the Canucks at this point. and be looking forward to finding a way out
And there is no better symbol for that resentment and distrust than Vanek and his s**t eating grin.