I suspect mask discomfort on long haul travel for most people is a purely a state of mind.( except those with breathing difficulties) A bit like economy travel. If you go into a flight thinking it's going to be uncomfortable, well, der, it will be. I've done a number of 7 hr fully masked flights during the pandemic (and several of those pre-vax with clear wrap around glasses as well) and too be honest, completely forgot that I was wearing a mask. And if you're on a full flight in economy it is the absolute least of your discomfort worries.
Put it this way, price and safety considerations being equal, if I could go on a carrier with 32" pitch, nine across on a 777 but had to wear a mask, or a carrier with 31" pitch and 10 across on a 777 but no mask, I would take the former every single time. Of course may feel different in business.