That's a hilariously antisocial response (no offense implied). I understand your signal/noise argument, and that seems to me a smaller, tactical issue. On net higher velocity of interaction is a benefit much like globalized trade is a benefit.

edit: here's an analogy closer to home. when a good, wealth-creating startup raises a second round of funds, diminishing marginal returns to capital means the average capital productivity might go down, but the total product (wealth created) tends to go up.