Kaliyev is probably just going to end up being another scoring prospect who didn't score enough at the NHL level to overcome his other issues. It certainly didn't help him to come to an organization that prioritizes defense perhaps more than any other in the NHL, but had he been able to score more he would have found a role.
I think the biggest issue for Kaliyev with his actual on-ice play was his inability to find himself in high-scoring areas enough (which is also a big knock on Byfield). Kaliyev had the amazing shot, and it is a world-class shot, not many guys could score the types of goals he had his rookie year in Dallas, but you aren't going to fire 30+ one-timers from distance passed NHL goaltenders, you have to have the sense to get into higher scoring areas, and it seemed like Kaliyev could never do that. Compare him Caufield (same draft, similar world class shot, many here had them as similar prospects) but Caufield is able to end up with the puck on his stick in dangerous scoring areas waaaaay more than Kaliyev ever was able to, and that is why he's 6th in the league in goals and Kaliyev is on waivers, it's kind of a thin line with these types of players. The problem is, you really can't teach game sense, guys either have it or they don't.
Maybe Kaliyev proves me wrong and becomes the modern day Robert Lang, who knows, but right now he looks like he's on a career trajectory towards the KHL, he is not a prospect or a "kid" anymore, he is at a crossroads.