I think they would’ve done Melbourne instead of Sydney. But LHR being added means it’s not actually a “rule” the devs always follow.
I don’t know how the devs choose new airports to be added but I think they listen to the community too and that’s how we got airports like LHR, SYD, (DEL)
I mean most of those are also huge airports, I would argue some are equally as famous. Also, many of the alternatives you listed aren’t even close, such as bkk and sin
“Following that rule” PMI will be good airport. It will be good airport because we don’t have West-midetarian airport.
I count and Bari is closer to east.