Parent commenter claimed that "the choice not to locate your company in SF is a sign of competitive intelligence". I argued against that, and in my opinion the available data appears to back me up on this.

Communication technology hasn't so far enabled, at least in the general case, geographically-distributed tech companies – otherwise we would be seeing an increasing trend of successful tech companies headquartered elsewhere. I don't think we are. Put another way, whatever advantage is conferred upon SF by physically housing an outsized share of tech workers is clearly giving it a competitive advantage that other locations have yet to overcome.