> Yet, others have plenty of problems with Xfinity. I’m sure some of it, probably a majority, is user error.

Everyone reading this: This is 100% true, and in my experience it mostly comes from the conflation of "WiFi" and "Internet" that people make. As you said, WiFi and Internet are two separate things. Anyone who is having complaints with their Xfinity download speeds should definitely reassess their router/wifi situation.

There are definitely problems with lots of coax installs in the city, but Baltimore's Xfinity coax deployments are - for the most part - pretty modern and robust. We're actually supposed to be one of the initial markets for multigig and DOCSIS 4.0, which will be a pretty huge evolution - so much so that consumer electronics are mostly not even ready for it yet.

But having said all that, there are also loads of old amps and out-of-spec splits that have been installed and forgotten over the years. If your service is spotty and you're confident with your in-home setup, it's worth asking Xfinity to send a tech to check your SNR. If you often have problems when the weather is bad, ask them to inspect the housing and installations of amps/splits to make sure water isn't causing issues, etc.