Right, but I still think that misses something, or maybe there is something about how the dynamic cache works that I am missing.
Scenario 1: Say you are flying from point A to point B, and the sim downloads all the scenery it needs along that route. Then you fly back to point A again (the same session or the next day). The sim downloads all that scenery again, except for what it already has in the dynamic cache. The more you have in your dynamic cache the less there is left to download. Larger cache reduces your download data amount.
Scenario 2: Same scenario, but you fly a fast aircraft such as a fighter jet at low altitude, and the sim needs scenery at a faster rate than your slow internet connection can download it (or maybe faster than the heavily loaded CDN servers can provide it). On the out flight you get slow scenery loading and a poor visual experience, on the return flight the scenery is already in cache. Larger cache reduces your required download data rate.
Seems to make sense? Or is there something else going on that I am not getting?