So the payout amounts will just be more volatile/random for the lower hashrate miners is what you're saying.
Yeah. I don't believe it affects profits. But lots of people are saying it is. So I'm still thinking about it to see if I'm wrong.
In theory, you should be correct. However, the statement is only true if looking at infinite time (law of large numbers), and probably no one will mine infinitely

The high difficulty increases variance, especially for "small" miners, and most people dislike variance.
I would like to see a smaller diff (like 128), especially for the fast coins, the smaller miners will (most probably) not find a share ever if unlucky (again, high variance)
btw: my 650kH/s miner found 3 shares in 4 seconds, two of them in the same second ...