It's a little too late now, no?

I wonder if they fell into a sunk cost fallacy with their camera-based approach.

Probably yes, but time will tell.

Right now, their chinese OEM bought them and seems to be committed to keeping their robovacs alive.

It is my understanding that US availability of the top models (such as 705 combo) may be limited, so here is a german youtube channel that has a lot of reviews of their newer units and compares them to the old ones (usually the S9 or 980, as those are the best units when it comes to vacuuming): https://www.youtube.com/@frickhelm/videos