Good than WN is enforcing the POS policy for passengers. Not others fault if you are a POS. They "knoe" the seat size "before" they purchase. So there is no bait n switch by the airline. If you dont fit, buy an extra seat period. Article below explains why the POS are complaining that WN doesnt bend the rules anymore for them. Good on WN for it.

Quoted from the article. "" At the gate, an agent asked whether she would need a second seat, suggesting that it was for the “safety and comfort of other passengers,” "". Why is this wrong ? The other passengers paid for their full seat and so deserve the whole seat. If you dont fit , its not the others problems. Take it up with the Aviation dept to force them to increase the minmum seat sizes . And it's crystal clear on WNs website - “The armrest is considered to be the definitive boundary between seats,” the airline says on its website. “In addition, Southwest may determine, in its sole discretion, that an additional seat is necessary for safety purposes.”. If you dont like it, feel free to fly another airline.

And this was the worst - "" Tigress Osborn, the executive director of the National Association to Advance Fat Acceptance, an advocacy group ""
What ?? To advance fat acceptance ? Off topic but they are doing more harm than good here.

https://community.triblive.com/news/4009315