Buy a Comma.ai and install it in a supported vehicle, and just try it out. It doesn't talk to GPS, but it handles left right gas brake on the freeway well enough, and that's with two fairly shit optical cameras and a radar system. Granted, geohot helped start the company, and he's no slouch, but if their system is that good, a couple things are true. A) Lidar isn't necessary b) Extensive mapping that Waymo does also isn't necessary c) that last 10% gonna take 500% of the time to get to L3/4/5 autonomous, and that last 1% is maybe never. The other day I was in a Waymo, and there was a semi totally blocking the street, backing into a loading dock. The Waymo correctly identified that there was an object in the way, and stopped and did not plow into it. At first it crept up to the semi, blocking it from making progress as well. It might have started backing up, I've seen them do that, but I was already on the customer support line as soon as I saw the semi blocking the road.

Comma.ai is probably the purchase I'm most happy with this year (to be fair though, I buy a lot of crap off Temu). Drives are now just "get on the freeway, and just chill." Pay enough attention because it's not collected to GPS and just in case something goes wrong. So to be clear, Comma.ai is not autonomous driving, it's classified as an ADAS, advanced driving assistance program. It just makes driving suck that much less, especially in stop and go traffic, for $1,000, and compatible with recent vehicles that have built-in lane guidance features. Waymo's got to be light years ahead of them, given how much money they've spent, so it's my belief that Waymo's taking it very slow and cautious, and that their technology is much more advanced than we've been told.