There are a lot of factors but I still believe far too much youth is the biggest issue. Ayton, for example, shows a lot of promise but there are probably 200 players in the NBA that add more to a winning club than he does. Bridges does a lot of things well too and is very promising but again, there's at least a couple hundred players that have more of an impact than he does. Same thing can be said about Oubre and even more so about Jackson. Melton and Okobo are not even in the same class as those guys, if they played for another team they'd likely never see the court in their rookie season.
Beyond youth, we have no continuity from previous seasons and no mid-career veterans that know how to win and can actually take part in it. Furthermore, our best player has missed a lot of games and when he's played he's either been just off the rehab table or in need of serious game conditioning. Our 2nd best player has missed a lot of games and also apparently played much of the season with a troublesome foot/ankle problem.
We've also had a tough schedule, tougher than last season if for no other reason than the other (previously) bad teams in the West are a lot stronger. Add in the new coaching crew and new system on both ends and the overall upheaval within the organization and our record starts to make sense. Even with all that I'd say we're still worse than we should be but not by much IMO. This is the price you pay for the decisions and mistakes we've made the past few years.