I am glad for this change. I do hope SWA will also address the number of carry-ons some passengers bring. 2 - 3 per person, all in the overhead bins.
I find the numbers of parents with children who are clearly preteens using family boarding is ridiculous. Same thing for the number of wheelchairs lined up and then those same people get off the plane with no problem once we hit our destination and no longer need wheelchair assistance.
Or mom with 2 kids, dad with 1 kid, grandma with 1 kid and grandpa with 1 kid, acting like they are not together. I see it every single time we fly to MCO. Most of these kids are well over 6. I do not wish for a family with littles to be split, but when people pay for EBCI, they get a B number and 40 people from "families" are boarded first, it is just not a good process.