(The last time I flew with United Airlines, they did that. Then they cancelled flights so I had to stay in Chicago overnight, and wouldn't give me back my cabin bag with clean clothes and things in it. Then they lost that bag and I didn't get it back for another three days. That was about a decade ago and I have never flown with United since then, nor will I ever again.)
https://www.marketwatch.com/story/these-airlines-have-the-mo...
- Ditch the standard rollaboard designs (especially hard-sided), which give the impression of being efficient but usually waste a significant amount of space. A bag (as opposed to suitcase-style luggage with stiff walls) has major advantages in maneuverability and simply taking up less space with its own material.
- Learn some of the rolled/bundled packing techniques to minimize wasted space and wrinkling.
Absolutely. They lead to a lot of the overhead space issues because they're relatively bulky and take up a lot of space even if someone has only packed for a single day trip. I get that some people have physical issues but, big a fan as I am on wheels for check-in luggage for the relatively rare occasions I need it, IMO it's mostly unnecessary for carry-on.
Some try to avoid bags in the hold (because of costs, time, risk) by cramming everything their cabin bag. And overpacking is pretty common.