I'll be bold. I think his ceiling in the NHL is somewhere between 50-65 points a year. Mind you, that's a ceiling, and I think it will take him a few years to reach it, but I'm also pretty confident that he will.
The thing that's so crazy - that will make me sound like a broken record - is his instincts. Everyone praises his defensive instincts and rightfully so, but I think that the offensive ones are just as good. And I know people will read that and go "what do you mean?! He's always playing it safe how can you even say that?" but... that's what I mean. When you watch him with the puck in the offensive zone its like... how do I say this? It's almost like he's too "humble" with the puck on his stick, if that makes sense. I've said this before, but Seids approaches the game like a soccer player - in the sense that he's going to make the play that maintains possession 100% of the time. But it's clear to see from watching him that he could force more offense if he wanted to. Right now, it just seems like he won't because he believes hasn't earned the pedigree to make plays that a 30+-year-old veteran #1D would feel comfortable making. He's gotten it hard wired into his system to make the "responsible" plays, which is honestly a blessing in disguise from a development standpoint. He doesn't want to "hog" touches away from his much more experienced linemates, even if he has more talent than any of them. Right now he's an information sponge, especially on offense; every shift he's out there he's taking in the flow of the game, learning how to take control of it - but he's doing it one step at a time. Making sure he can be dominant with his fundamentals before looking to expand his arsenal into more higher-end stuff. The longer he plays and the more freedom he gets (more importantly, the more freedom he allows himself) over time the more he's gonna develop that swagger where he can make those riskier plays because he knows "f*** it, I'm good enough to do it".
I know I'm obviously biased as a Red Wings fan and that this is only borderline "analysis" with a very healthy dose of speculation, but I see Moritz as a guy who will get into the league and make an impact, and then continue to get better every year. I wouldn't be at all surprised if he followed a similar path to Roman Josi; someone who flies under the radar because only fans of his team see how much better he gets each season. And yes, I know I just compared him to a Norris winner; that's my point.