Yes Comcast is the definition of poor customer service. We were forced to have them when we lived in an apartment. I haven’t had any issues with the customer service I received from AT&T and before that Bellsouth. But I also use OTT providers for TV service.
AT&T Fiber in my experience is a lot more reliable than Comcast ever was. Even thier old DSL was reliable.
My mom has had DSL for years in the small town I grew up in. She got cable internet when I stayed there for the summer because I needed more speed to work remotely. But she decided to keep both. The cable for better speeds and she said after 50 years of dealing with the phone company and 40 years dealing with cable, she trusts the phone company’s reliability more.
If a smaller ISP could offer the reliability of the incumbents, I might switch just to support them, but they would have to do a lot to gain my trust.