I can't say I'm in favor of it, in fact I'm not sure it matters so much once you are on the airplane. However, I fly almost every week for work and I've noticed some giant benefits.
From most to least important, here are my reasons:
1. People talk less with the masks, which makes me very happy whenever I have to be on an airplane. Please do not talk to me unless you are asking what I want to eat/drink, thank you. Yes, I'm ok with sitting in the exit row.
2. Fart smells don't seem to be as intense with masks on. Ma'am please go to the restroom before you exercise your colon again, good lord.
3. There is no such thing as social distancing at the airport. People press together, standing dick to asshole in the security line and then again at the gate. I actually liked not having my personal space invaded. I liked it a whole fucking lot.
4. I love to travel, my husband is less enamored. My husband is also a germaphobe. My expectation is that vacations without a mask mandate are going to be harder to cajole than they have been with everyone masked up.
5. Seeing the people that weren't willing to wear their masks made it really easy to pick out the unpatriotic assholes. Their country asked them to do the least little thing for their countrymen and they couldn't be fucking bothered. I like knowing who those people are so I don't accidentally get myself mixed up in their anti-American shenanigans.