I'm generally in your camp (having been through 3 monolith-to-microservices migrations), but to be fair, at least two of your examples are pretty massive outlie

I'm generally in your camp (having been through 3 monolith-to-microservices migrations), but to be fair, at least two of your examples are pretty massive outliers: * Instagram barely had any features when it was acquired - the entire API was like 3-4 endpoints, and all the web version did was literally _show a single photo_ * Whatsapp was extremely brilliant in its implementation/choice of language (erlang) - they beat competition's headcount 10:1 for the same scale due to that, but hiring Erlang engineers is no easy feat Facebook is also famous for its monolith approach, so I wouldn't necessarily put Google and Facebook on the same page when it comes to the CS Gods they worship (-: