I'm not as high on Andrews as I was. I want better hands from a guy that plays in his role. We need guys that can make contested catches. And I think to some degree, Lamar over relies on him. So some of his success might also do with forcing him the ball a bit.
He's excellent at finding soft spots in zone. But other than that, what's his big strength? It's a bit ironic at this stage, but I want a guy who can catch the not great throws to match Lamar's accuracy being not perfect, and that felt a bit more like Hurst. I think Andrews could put on more bulk and he's underrated (or maybe rated) as a blocker and gives you more than you'd expect there.
All that being said, Lamar trusts him. And if you can coach all of that up right, Andrews is worth a lot. His performance follows right in line with Kelce's first three years in the league, noting that Kelce actually missed most of his rookie year. So I think upside can still be there for Andrews, too. If you think he can improve on the contested catches, sign him long-term now. If you don't, I'd let him play out the rookie deal and then decide after a year of hopefully improved passing on offense as a whole from the team.