Since when Comcast/Xfinity Cisco Router changed url from http://10.0.0.1 to https://myrouter.io/?

Hi Everyone

Since when Comcast/Xfinity Cisco Router changed its url from http://10.0.0.1 to https://myrouter.io/ (was there an email announcement?) and why do both always give warnings about certificate error and I have to add them to the exceptions? Why can't Comcast/Xfinity or Cisco install certificates on the devices since they're so concerned with security, since, many novice users wouldn't even know how to add the exception? I assume exceptions could be risky and open to malware injections or bypassing some protocols?!

My main question is https://myrouter.io safe and also safe to add the exception?

Thanks