If they do then I hope there is an additional rule forcing the guardian to purchase an adjacent seat, so there's no risk of someone (me) being guilt tripped into swapping seats.
This is addressed in the first paragraph of the article.
> The FAA has one of my favorite examples of thoughtful rulemaking. They haven't banned flying with a baby on your lap, because the extra cost would mean many parents would drive instead. Since driving is far less safe than flying, a ban would lead to more deaths. I'd love to see more of this "all things considered" thinking around bans.
This sounds like a different problem than the one this post is about. For baby-in-lap, no one is being guilt tripped into switching seats because the baby doesn’t have a seat.
If you’re being guilt tripped into switching seats so that a family with a young child can sit together, consider blaming the airline for not automatically seating a young child next to their guardian.