uMatrix isn't a typical consumer-friendly adblocker, it's a general purpose request blocker and explicitly warns that it will break many things. uBlock, AdBlock, etc., will generally not. Certain things do still break occasionally, but it's pretty rare and usually it's on a site that I don't actually care about. Disqus comments are blocked deliberately by most tracking blockers because Disqus tracks user behavior and discloses their data to third parties.

Which servers? And why should Bloomberg break if you block servers on different domains?

Or "we might start blocking ad blockers, in which case you won't be able to see it, so your performance may suffer"