The point is to make it universally available, like the ingredients list on food packages, not just "freely available."

How available is knowledge if nobody knows they can attain it? This is the first I've heard of seatguru, and given the post you responded to, I'd hazard I'm not the only one.

Have you ever tried to search online for information about quality of seating in airplanes? In that case, I'm surprised you didn't cross seatguru before.

You can go really deep down the rabbit hole of seat knowledge with Seatguru, but it's quite time consuming. Their flight search is reasonable, and probably many people who care about seats do use them. But the majority probably does not even suspect that there are major differences in seat sizes between airlines and even planes. So having that information more visible across the board would change incentives more. I also suspect given how many booking sites make money they would be dis-incentivized to do this on their own.

Wow, not the same thing at all as the airline disclosing it up front. I should not have to go looking at third party sites for information like that.