We will agree to disagree then. Work patterns here in the USA are very "pulsatile". Peak demand for transport in the morning and afternoon for people commuting to work. I just don't ever see the fleet getting that large, and for that reason there will be things like "demand charges (a la Uber)" which will either upset people, or result in insufficient supply.
Additionally, you are never going to get people with 100+ mile per day commutes (tradesmen, etc.) to pack up their tools and hop in a robotaxi. This part is a byproduct of a larger country, and I expect this would be far less than smaller countries with shorter commutes.
Finally, you have people like me and my family that just have to leave on the drop of a hat (my wife runs a mobile business with same day appointments). We use Uber services when vacationing if possible, but for primary usage it's a no-go from the start.
This is all true, and honestly, from my perspective I'm right there with you about never wanting to be without my own vehicle. But, I'm rural, and most of the population is urban. Most of those people in the urban areas are not within the classes of tool-bearing tradesmen as you have described. (and yes, some are, and they will want their own vehicle)
However, the greatest demographic for Robotaxi are those people who don't need their own vehicle, don't want to drive, and who are among the unskilled, unsafe, and distracted-behind-the-wheel groups as well. These are very likely the largest sector of potential customers, particularly if you add in those already using mass transit and Uber for their primary means of mobility. They are probably the leading cause of collisions and injuries as well as being a significant part of the population in general.
It is easy to see things from a perspective of my own use scenario and discount how anyone else might feel otherwise, much less, that it could be MOST other people would. In this case the actual number of people who would use Robotaxi instead of owning a car could easily be significantly greater that many might think.
Add to this how some Robotaxi users might own a vehicle and also use Robotaxi for many/most local travel simply because it is affordable and more convenient for a lot of run of the mill trips. Those tradesmen might leave their work vehicle at home and take a Robotaxi rather than expose the tools of their trade to unnecessary peril. Reduced wear and tear on the owned vehicle, no parking hassles and so on are other considerations.
IIRC, the numbers indicate that riding Robo may actually cost less than maintaining an owned vehicle. This translates to a longer lifespan for the owned vehicle that is kept in the garage whose frequency of use is being offset with Robo use.
And, we haven't mentioned how the owned vehicle could be making money as a Robo for some vehicle owners as part-time in a Robotaxi fleet.
These are likely not all aspects to be considered, but make a reasonable argument to discount the idea of any desire/need to own a vehicle being an impediment to Robotaxi use.