Those look like Premium Economy seats based on their generous width, not the crushing 17"-and-change width of typical Economy seats.
All the pictures are of women in the seats. Men often have broader shoulders and larger upper arms. If I sit next to another man, we sometimes make contact on the upper arms for most the flight. The wings seem to take up a couple inches themselves, so it could become too cramped horizontally to be comfortable.
As a person with very broad shoulders... I cringed when I saw these seats, heh. Usually I fold in a little bit for larger people, but on Southwest other large people get the idea that sitting next to me might not be a comfortable experience for either of us and avoid me. And if someone is being ride and I expand my shoulders they can literally be in 1/4 to 1/3 of my neighbors seat. Oh you leaned forward? Allow me to show you my true form, heh. Usually get seats with extra leg room and use that to occupy less space and not make my seat neighbor uncomfortable.