First class, built in integrations. While an open API is offered so anything can be integrated, nothing is going to beat custom built in integrations for user

First class, built in integrations. While an open API is offered so anything can be integrated, nothing is going to beat custom built in integrations for user experience. Also, built in integrations are always a step ahead in terms of time to market too. Even if only by a few weeks or months, this really matters. The example I'd point out is integration of Typescript vs Flowtype in VSCode. The Flowtype plugin maintained by the community was a good effort, but was always quite a way behind the native Typescript integration. There are more reasons for this than just technical, obviously, but that's one of the main ones. I think, having been a user of both, the awesome native VSCode integration was a huge factor in Typescript 'beating' Flowtype. It'd be a similar idea for Azure too.