Brand spanking new.
The one in HK was the largest reclamation project in the world when it was built. It sits on an artificial island as big as Kowloon. It is a huge (300 gates) but somewhat sterile looking airport.
The Singapore airport opened about 5 years ago and has basically an amusement park in side. The airport is a tourist attraction.
The Istanbul airport opened in 2021 and looks like a shopping mall.
All of them are huge easy to use and attractive.
Nice, unfortunately, it’ll never happen in the US. Thanks for pointing out my error in the overbroad “everywhere” remark, lol.