Well now you're asking a different question. Robotaxis clearly work today and are rapidly improving. Waymo is past the technical demonstration stage and has paying customers. Alphabet doesn't report profitability for that unit but it will probably take a number of years until they can drive down costs and achieve economies of scale. The senior leadership seems to be willing to fund this initiative indefinitely.
Several other carmakers beyond GM are still pursuing L4+ autonomous technology. So apparently they don't think Waymo is wrong, although they're way behind.
It's not a different question. Passion projects that aren't profitable don't last. It doesn't matter what a technology can do if there's no reason to use it.
No. The big automakers are abandoning this idea. Why? Because they don't see a path to profit. They've been at this for 120+ years. Their judgment is probably better than some ads company with an automotive side project.
Several other carmakers beyond GM are still pursuing L4+ autonomous technology. So apparently they don't think Waymo is wrong, although they're way behind.