>I know Microsoft will move or even outright delete important content because chasing shiny new ideas will get somebody promoted. And so I direct people away from Microsoft
Do the other providers that you recommend in place of Microsoft have a better record of not changing/removing URIs on their website?
Yes. You might be underestimating just how bad Microsoft are at this.
I was originally going to say that although the links on the Microsoft page currently work they can't be expected to stay working. They had worked when I last needed them after all. But that was at least a year ago and so I followed one, and sure enough meanwhile Microsoft had once again re-organised everything and broke them all ...
Even the link to their current list as XML (on Microsoft's site) from this page is broken, it gives you some XML, as promised, but I happen to know the correct answer and it's not in that XML. Fortunately the page has off-site links to the CCADB and the CCADB can't be torched by somebody in a completely different department who wants to show their boss that they are an innovator so the data in there is correct.
Microsoft provides customer facing updates for this work by the way. The current page about that assures you that updates happen once per month except December, and tell you about January and February's changes. Were there changes in March, April, or May? Actually I know there were, because Rob Stradling (not a Microsoft employee) mirrors crucial changes to a GitHub repository. Are they documented somewhere new that I couldn't find? Maybe.
Do the other providers that you recommend in place of Microsoft have a better record of not changing/removing URIs on their website?