I think the weight limit for what you can put into the overhead locker needs to be brought right down to a safe limit. I see people struggle with their bags every single week.

If the aircraft hits severe turbulence and a few locker doors popped open, a few 23KG bags flying out isn't going to leave a pretty sight.

Plus, some of the bags are larger than they should be - you see the locker doors bent out of place when they are shut. Some passengers realise their bag doesn't fit properly into the overhead locker but just leave it there for someone else (usually the cabin crew) to sort out.