VERY good point. The multiple stop challenge is legit. Can it be "worked around"? Yeah, maybe, sometimes, but others would be painful (or impossible) - I'm not going to physically cart a bag of mulch around from one stop to the next. This is one reason I think the initial first "replace car ownership" use case (well after the "replace Ubers" use case) will be "replace SECOND car" at least in any kind of Suburban setting. I ASSUME folks dwelling in places like NYC might be able to adopt RTs much sooner, but for Suburbanites it will take some doing.
In truth, I wonder if many of these scenarios are just problems to be solved differently and I am just thinking of models that replicate today's problem the SAME WAY but with a RoboTaxi.
@Knightshade 's comment about just using Instacart comes to mind as a different way to address grocery runs (admittedly, not w/o its own issues, but I digress). Heck, some of the roadblocks I am throwing up sound a lot like the complaints about EVs (i.e. they won't go 500 miles, charging needs to take 5 mins like a gas fillup, I need to tow 10,000 pounds up mountains, etc. ) - all valid concerns/comments, but things that, once we started actually driving EVs we began to see how there were workarounds for these issues or they just weren't that big of a deal after all...or we just had a second car (that spent a lot more time just "sitting" than most of us expected before we got our first EV).