Mostly because of mass. I think the cost of these probes scales with mass and adding those cheap gadgets would displace other scientific instruments. A 60fps camera might be interesting for entry but then it's mostly useless on the surface. And it would take a veeeeeery long time to transmit video (even if you downsampled in spatial and temporal resolution it's just not worth it).

As pointed out elsewhere in this thread, the consumer grade devices cannot withstand the extremes of space (not just temp extremes, also high energy rays/particles we're shielded from here).