Does anyone know whether these airports actually want preclearance? What are the governments of the countries with these airports, and the airports will approve this in a timely fashion?

Going through pre-clearance often seems to be more of a hassle if one is connecting from other airports, particularly in Europe.

I was surprised that Munich and Frankfurt were left off the list, with their large number of flights to the US. The way that Munich currently separates many US flights, it is actually one place where pre-clearance would likely not add to the hassle that already exists.