Most major international transfer airports (e.g. Narita, Hong Kong, Schiphol, Changi, even Moscow) have nice air side connections that don't require entering immigration. Ya, they'll still security screen you, but it is much quicker than when initially broadening.

America is unique in requiring all passengers to go through immigration, but in that case they are usually going somewhere else in America anyways so it would be a port of entry. Sucks if you are transferring in Miami to go to South America, however.