Earlier quoted context omitted.
The Google Maps situation is a great example of why this will be hard. When Apple switched to their own maps it was a huge failure resulting in a rare public apology from the company. In order to switch you have to be able to do absolutely everything that the previous solution offered without loss of quality. Given Google's competence in AI development that will be a high bar to meet.
I was in agreement with the parent before I read this, and now I'm in agreement with you. It is a great example, I know so many people who never switched back to Apple Maps because it was so poor initially. Personally I find it a considerably better experience than Google Maps these days, but those lost users still aren't coming back.
Maybe I'm weird but mobile assistants have never been useful for me. I tried Siri a couple of times and it didn't work. I haven't tried it since because even if it worked perfectly I'm not sure I'd have any use for it.
I see it more like the Vision Pro. Doesn't matter how good the product ends up being, I just don't think it's something most people are going to have a use for.
As far as I'm concerned no one has proved the utility of these mobile assistants yet.