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Did they ever actually specify what they meant with that promise?
I mean, datapacks ARE a modding API. Not the kind we would have liked to see, but if a modding api is all they promised, then they did deliver on that.
It’s called data-driven modding, and not exactly a rare approach among official modding APIs.
And even then, the only reason Steam ended support for Windows 7 was because it’s an Electron (Chromium) application. They decided to upgrade their version of Electron, probably to take advantage of newer security fixes in Chromium, which forced them to drop Win7 support because Chromium already had ended support for it.