Smith's body is starting to slow down from a lot of hard miles. He never had the frame of an NHL heavyweight, but has played the game like one for his entire career. Guys with bodies like his who plays the way he does unfortunately don't get to enjoy long careers most of the time. He definitely looks like a guy who is feeling the effect of a "live fast and die young" style of play over the course of a decade+ of hockey.
I wish we had a room full of 22 other guys who cared about hockey the way Zack Smith does. It sucks that he's only going to get worse at this point.
That's a bizzare thought given that Smith hasn't played the way you describe in the past few seasons and had his most succesful time in NHL in that span. Smith used to play the more rugged style when he initally got in the NHL but has recycled his style of play to be more offensive than physical in the last seasons. That goes back to the time Dave Cameron was here and even before that Maclean tried him in the top 6. Smith talked about that and mentionned he wanted to contibute offensively more rather than just being a grinder like he was previously. Cameron also mentionned he thought Smith was a better offensive player that given credit for and that's why Cameron started to play him more and more on the PP back then. Everyone was mad at Cameron for giving Smith so many chances on the PP until he finally broke out with Stone and Pageau and everyone forgot how much they hated Smith.
He'll lean on guys, fight from time to time but rarely, he's not the type of player who makes big hits anymore or that gets hit a lot either. I would agree if he played his entire career the way he did in the past but it's not the case. The last two season were his most succesful seasons in the NHL so far. This season has been terrible for everyone on this team from the top to the bottom of the lineup other than Mark Stone and Ryan Dzingel. Smith has also been injured this season. He actually had a pretty good start until he got injured. I don't really see signs of his body slowing down either. Plays with the same speed and same style as last seasons, he just hasn't been that successful like the rest of the team.
Smith has always been an inconsistent player to begin with. He's not the best offensive player so when he's not with Stone it's obviously not the same and you won't get the same results. I don't think people should really be surprised that he has a down year. 3 seasons ago everyone wanted this guy gone because he was a plug and he was done until he came back and had great seasons... Not everytime a player has a tough stretch (especially in a season like this) that it means that his body is slowing down and all that stuff we hear about players who are close to their 30s.
Smith hasn't been physical for a long time and it's certainly not because he's slowed down.. He was like 25-26 when he started playing this way and has only been more successful so I don't see why that's a sign of slowing down. No need for him to play the way he used to if he can be successful this way.