I get this for Arizona, they have a lot of great youth/prospects already, and are willing to trade some young pieces to improve today. Hammer, Stepan and Raanta do make them a lot better, might be enough for them to push for the playoffs.
For NYR, this makes less sense to me. They're trying to win now, right? How are they going to do that with terrible centre depth? Also, 7th overall sounds like a sexy pickup, but this is a pretty garbage draft, it's not as valuable as it seems. I'm not a huge fan of DeAngelo either. Hopefully there are more moves coming that make use of the cap space they freed up, if not this is a bit of a head scratcher.