Another hinderance that you did not mention, maybe because it's not a problem to you, is the 90 bag rule,
A few years ago RYR trumpeted its partnership with Samsonite who had produced a RYR size cabin bag. RYR have been pushing cabin bags only for years and this venture, they said, guaranteed you could take it in the cabin. It is smaller than the norm, of course. Then they discovered the lockers could not accommodate enough of their specially designed cabin bags and their guarantee dissolved. Now this max numbers rule. Luckily they have not introduced a RYR designed bag that can fit 'under the seat' for free and then charge for the larger size that requires the overhead lockers. Oh dear; have I given them ideas. Wiz Air are doing something like this, and are not the major share holders of RYR & WA the same?