The main problem is that micro service based architecture is sold as a silver bullet that takes care of all problems.

Knowledgeable and experienced people know that there is no free lunch, but not every opiniated voice isn't necessarily so, and refuting bullshit takes ten times more effort than producing it, so objections might be handwaved away as backwardness if there is a strong force for a modern architecture.

I mean, more of the same old shit isn't exactly an easy sell either, even if every old bad choice could be rationalized at the time...