I just tried renegotiating with coaches in the new UI today, and I found it so frustrating that I just switched back to the old. Way too different. The old you can pull up and resign a coach without ever leaving the team home page. On the new, there is no more coach card, you have to go to a new page for each coach. When you try to resign, everyone defaults to head coach instead of the position they already held. The coach page doesn't even tell you what position the coach holds.
Resigning of both players and coaches is awful in the new UI. It needs to be closer to the old. Critical information is now at the bottom of the page instead of the top where it was and should still be. Sliders are gone so you're typing everything, and it's not clear what the ranges are on the values. Please get these back closer to matching the old version.