This is not about microservices talking to each other, but rather about seeing customer-facing product as a whole with all its different components and their ve

This is not about microservices talking to each other, but rather about seeing customer-facing product as a whole with all its different components and their versions. And yes we can agree that there are various (usually "greedy") strategies to simplify this - but this problem is a fact of life and it makes thinking process easier to accept it as such. Same as accepting that it is impossible to solve consensus in async system, but there are algorithms that perform fairly well. + I summed this up in more details in the comments down below.