When it came out, Github Copilot was an autocomplete tool. That's it. That may be what the OP was originally using. That's what I used... 2 years ago. That they change the capabilities but don't change the name, yet change names on services that don't change capabilities further illustrates the OP's point, I would say.
Microsoft may or may not have a "problem" with naming, but if you're going to criticize a product, it's always a good starting place to know what you're criticizing.
I do agree that conceptually there is a big difference between an editor, even with smart autocomplete, and an agentic coding tool, as typified by Claude Code and other CLI tools, where there is not necessarily any editor involved at all.