“At another interview, this time at a top-3 bank in Russia, they said among all 10+ product teams that they have it is strictly forbidden to use reactive programming, exactly for the same reason.”

In that case they’re going to have an interesting time with Combine and SwiftUI, as it’s pretty clear that’s where Apple development is heading.

The good news is that if you learn Combine/Rx, you can avoid learning the nitty and gritty in’s and out’s of most of the other mechanisms.