It's definitely not bad. It provided poor miners with a decent place to live. Today a lot of them are still here, renovated and retired miners still live in them, most of them for free (my grandparents for example).
Yep. It also led to one of the bloodiest government orchestrated massacres in US history when striking miners were cleared from their homes in Ludlow, Colorado by the national guard [0]
On a more serious note, though, some employers do want to build housing near their headquarters (such as Google, for example), but are blocked by city councils. From what I read here, it sounds like you can't put up new housing anywhere near SF.
https://www.mercurynews.com/2017/12/12/googles-massive-housi...