I don’t think this is on the passengers. If checking luggage in wasn’t an extra fee (often), didn’t carry a material risk to have your luggage lost, damaged, la

I don’t think this is on the passengers. If checking luggage in wasn’t an extra fee (often), didn’t carry a material risk to have your luggage lost, damaged, late, stolen, and didn’t mean spending an extra 30–60 minutes waiting to collect it then I’d bet a lot more people would check luggage in.