Having done exactly this type of integration with legacy systems I think a point that gets glossed over is that it's the startups themselves who are full of engineers who think that the whole world has moved on to using NoSQL Node.js RESTful JSON APIs in the cloud (that buzzword soup was intentional) when the reality is that the majority of established businesses are using unsexy and what they would consider to be "legacy" technology.
So you have companies like one I was recently a part of integrating a Node web app and API with SOAP and SAML end points and suddenly it's everyone else's fault that things are hard when really you probably should have thought through those tech stack choices before you started.
I'm not saying the article is wrong. I agree with it wholeheartedly but there's a lot to be said for not researching the market you're about to jump into thoroughly enough before you begin.
So you have companies like one I was recently a part of integrating a Node web app and API with SOAP and SAML end points and suddenly it's everyone else's fault that things are hard when really you probably should have thought through those tech stack choices before you started.
I'm not saying the article is wrong. I agree with it wholeheartedly but there's a lot to be said for not researching the market you're about to jump into thoroughly enough before you begin.