The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
So, if you look at the surface area that they pack in their lungs relative to their body size, it's not very impressive. Whereas when you get to mammals, the amount of branching that you have is you have four to 500,000,000 alveoli.
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About 70 square meters, which is about a third the size of a tennis court.
if you took the Alvar air sacs of the lungs and spread them out you would easily cover a tennis court
So you have a membrane inside of you a third the size of a tennis court that you actually have to expand every breath.