Well, it's definitely "interesting" because it was a weird and user-unfriendly restriction on previous M1/M2 Airs and now it's gone. So that is interesting for sure.
Perhaps more to the point, you're right -- Apple doesn't deserve to be lauded for removing something that was a dumb restriction in the first place. But it is interesting considering this is the most popular laptop in the world.
I don't think there is anything interesting. Someone on the hardware side thought it would be great to hardwire one of two the display controllers to the internal display. That would explain why M1 and M2 can't be fixed in a software update and why the Mac Mini supports two external displays.
Restriction implies they made the deliberate decision to withhold or break functionally. Limitation is probably more accurate, because they didn't put the extra work to make it work properly.
From a consumer standpoint? Apple sells about six million Macs per year and the Air is their best-selling computer and anecdotally it is popular with the HN crowd. So it is objectively impactful. I would call that therefore "interesting" but at that point we're splitting semantic hairs so whatever.
