At some level it both is and it isn't. The problems behind scaling a distributed application are quite well understood at this point, the problem that hasn't been solved is that too many won't accept the answer in terms of development time and discipline. The mess that could be created with micro-services which simply recreated the mess within the monoliths, was both predictable and predicted.

At some level it's the Forth Bridge all over again. The Forth bridge was constructed within 10 years of the Tay Bridge disaster. It wasn't that civil engineers of that time didn't know how to build bridges that wouldn't fall down, they just hadn't learned to not go with the lowest bidder.