The airlines do not want people traveling - they just want passengers.
They don’t have a problem if you travel with no luggage - you have your seat, but don’t take any of those things you need or want with you!
I will refuse to patronize any airline that charges both for checked and carry on luggage. At least, until I have no other choice - and then I will never fly for anything but business.
Hauling a bunch of skinny people who pack light is much cheaper than hauling a bunch of fatty-fats with tons of luggage.