I resonate with a lot of what is said in the comments. Last mile API tooling is underrated and most companies don't have the deep API platform expertise to build from scratch. The OSS options in the space proved SDK generation could be done but the actual product that you got in hand still needed a lot of work to be enterprise ready. The code was poor quality, wasn't customisable and there was no change management story. We're seeing a new wave of work in this space that's making api platform engineering much more accessible.
The API devex story starts with SDK creation and maintenance but there is a lot more to come!