Offensive issues - by design or individual incompetence?

So it’s beyond obvious, especially last night, that we insist on doing the whole give it to KD and Sengun and wait for a double-team strategy. That part is not a mistake but I wonder what else is. Do we have players with low IQ who do not know (yet) where they need to be on the court in case the double team comes? Is it a question of timing, so we’re moving too late, which is when they are under such pressure and force a play, turn it over or simply just rush their next move (pass, shot, attack)? Is it that we have low IQ players? Or is it by design that we just stay in our positions outside the 3pt line and rarely anyone cuts to the basket?

For the life of me, I do not understand how a professional basketball team, with great to elite players like KD and Sengun cannot seem to grasp the simple concept of moving, cutting, getting open. This seems to coincide with Sengun and KD holding the ball way too long, being indecisive and even when we make that first pass, we do not pass it quickly enough and let the ball travel the distance and catch the defense on their toes and or just have take advantage of that space that should be there for a split second or two after 2 defenders are caught on 1-person. I know spacing and lack of good hands and passing is an issue, but there has to be something to this that either I am missing or our coach, the team and or the individuals are not doing correctly and I want to figure out what’s going on.

Any thoughts?