If I am not overlooking something, the Config component consists of three things that have little to nothing to do with each other:

• Configuration definition/validation (in Config/Definition)
• Configuration loading (in Config/Loader)
• Caching things in a file on disk with a revalidation mechanism (ConfigCache et. al.)

I came across a PR discussion lately (will try to find it again) in which (Drupal?) folks complained about depending on the Config component IIRC. Not sure whether the dependency itself was a problem or a dependency on too much/wrong stuff, though.

It was just an observation I wanted to log somewhere. If it was a deliberate decision, feel free to close it. Needless to say that'd be a BC break.