What I've seen a bit recently is that people with standard wheeled carry-ons were asked to put them right next to the plane when boarding and the crew put them

What I've seen a bit recently is that people with standard wheeled carry-ons were asked to put them right next to the plane when boarding and the crew put them in a separate compartment. When leaving the plane, you would pick it up at the exit. It's a compromise between checking it and having it close to your seat at all times, and seemed to work quite well.