Consider a minimalistic sliding panel saw in the picture.
It seems to me that anything you can do with a rip fence you can do better and safer using the sliding panel.
Crosscuts: you wouldn't use the rip fence at all even in a standard table saw. You can however use the rip fence as a 'quick measuring' tool when you are cutting many pieces of the same width (in this case you would pull it back enough as not to overlap with the saw disc).
Rip cuts: with a sliding panel you can clamp down your piece to the sliding panel and calmly push the panel with one finger from far away. Using the rip fence, on the other hand, you would be fighting a lot of friction + the anxiety of keeping your piece snug against the fence + the anxiety of kickback due to poor pushing technique.
Yet again and again I see in many videos that guys with even more sophisticated sliding table saws inexplicably use the rip fence to make rip cuts. Why would they do it? To me, it looks awkward at best.