Well Boeser is nowhere near the level of Hull so that comparison aren't really relevant. Also, Hull's best seasons has prime Oates and Modano as his center, it wasn't like he was scoring 70 with nobody good feeding him the puck.
Lets just say that we have our difference preferences, and we probably see each players differently going forward. I think Boeser will have a much steeper decline sooner due to foot speed, so any long term deal for him is extra risky comparing to Ehler. And that is essentially what it is signing a long term deal for these guys, its how you project them going forward.