I dunno here. CR's validation around the fact that users will often visit different sites seems on point to me.

Some users visit the same sites over and over, true. But, a more accurate browsing pattern would be different sites, new content etc.

A more in-depth detail on how the browsing is done (automation) might be relevant. If they hit the same 5 sites 1000 times vs. 1000 sites 5 times would alter whether they disable cache or not. I'd say the former makes sense, not the latter.