Wait a minute, I distinctly remember, years ago, when airlines checked all bag free of charge. Then they discovered an excuse to enhance revenue by charging an excessive amount for checked luggage.
Think about it. For what airlines charge to check a bag, they could hire someone, at more than minimum wage, to hand carry each bag and put it on the plane.
In my case, I do not carry-on to avoid fees; I carry-on to make sure my luggage doesn't get lost. Originally, I didn't think about carrying-on to avoid losing my luggage, but in the 80s, on two separate trips to Europe, my luggage 1) almost got left in Boston while I flew to Brussels, and 2) almost went to Bogota, Colombia, after a short flight from Frankfurt to Paris. When I heard Rick's advice to carry-on I immediately embraced the concept. It's very difficult for an airline to lose you bag if it's always in your possession
For years I carried my bag on, and there was plenty of space in the overhead bin. Then airlines decided to hide some of the ticket price by charging for checking luggage. Then so many people tried to carry-on, often with oversized bags that didn't fit in the overhead bins front-to-back, and it became difficult to find space. If this change means more space in the bins, I'm all for it.
I sort of doubt there are all that many travelers in that category
Acraven: I think there are a lot. I noticed a big drop in the available bin space when they started charging to check a bag.
Airlines were losing money before they discovered checked bag fees. I suspect they still lose money if you don't check a bag and don't pay the extra fee.