I'll ask again since nobody replied the last time...

If difficulty doesn't matter, why do pools even have a choice on what difficulty to go with? Why is there VarDiff? Since difficulty is meaningless, people who spent all the time developing those systems (as well as those who implemented them into their miners) wasted their time on something that supposedly means absolutely nothing.

Since difficulty has no real value, every pool/miner should be set at a hard-coded 1024 or 2048 or (insert difficulty here). We clearly have no need for more than one option.