I'd be more concerned about cost. With the advent of self-checkin boarding passes have become largely homogenized - boarding passes used to actually be printed

I'd be more concerned about cost. With the advent of self-checkin boarding passes have become largely homogenized - boarding passes used to actually be printed by the airline, on their own paper stock, instead of the airport authority's touch terminals. This isn't an environment where the airlines have a great deal of control over what gets printed, or the printers doing the printing. Going from the extremely cheap thermal paper printers I see in these machines to full-color, thick card stock (like it was in the Good Old Days) would be pretty darned expensive. Unfortunately the airline industry today is hyper-competitive to the point where anything that does not generate higher bookings and higher sales is basically just all cost and no benefit. Unless these easier-to-use boarding passes results in more bookings, it just doesn't make financial sense for the airlines, who are cash-strapped as it is without being tasked with replacing tens of thousands of printers.