They solve different problems, some of which may overlap I suppose. For one thing you get clear ownership of deployed code. There isn't one monolithic service

They solve different problems, some of which may overlap I suppose. For one thing you get clear ownership of deployed code. There isn't one monolithic service that everyone is responsible for babying, every team can baby their own, even if they all share libraries and whatnot. You also get things like fault isolation and fine grained scaling too.