According to Jones, Payne was traded as they wanted to change the way they play. Become more big and versatile with playmaking and shot making, and defense. We're a team full of dual guards - no real PG.
Allen is tough call, he brings value but not 80M a year tax value. If this team was a title winner as is, I can see them justify it. To be a 45 to 48 win team, which is what we are, I don't see the justification.
Which goes back to the main problem with the team. The dependence on the big 3 being healthy. When healthy, they look like a quality team. The issue is they're on pace to get 34 games from Beal, and 20 games from the big 3 together. That's not going to get you titles. So paying for depth pieces like Allen, seems a hard sell for me. Not my money and I'm not a billionaire and may still be suffering from the Sarver era.