No, it's pointless to complain about the existence of a backdoor, locked or unlocked because there is a front door that is not being locked.

I get that you don't like lawful intercept. That's fine. But focusing on only that aspect of telcos derails the conversation and prevents us (in the very broad sense of "us") from making progress on things we all agree on. Can we stop bikeshedding and agree that telcos are critical infrastructure and need to be highly secure in general?

A hacker in control of a telco can do as they please regardless of any backdoors or lawful intercept systems. They can just use regular network functions to route calls wherever they want.