You are right about investors, but how many of those investors have also funded and continue to push for vaporware products and features? We have seen this many many times over the last couple of years. So I do think their importance needs to be downplayed since they are clearly making bad decisions.
Also, this article was about customers not investors.
Apple for years has been marking "Siri" as far more than just the voice assistant and instead encompassing many of their ML systems. For example the "Siri App Suggestions". I don't think that rebranding it would make any sense.
Your first part, not true however. Many people are concerned, see the issues with it, and are frustrated and distrust it even more when someone so clearly tries to discount any concerns, fears, or just dislike of it.
Fact is, most users don't care about the underlying technology. Most users did not need "AI" shoved in their face to enable many of the ML workflows that we are currently seeing rolled out.
I don't understand how Siri is so bad. If you just hooked it up to ChatGPT then Siri would actually be incredibly useful. The only reason why Siri still exists is because iOS doesn't let you replace it.