These complaints about Google "moving too fast" used to really confuse me. I couldn't really spot a meaningful difference in mean survival b/w Google products, start-ups similar to individual Google products, and other businesses' behaviour.

But I've now attained zen-like clarity on the issue: the complaints are coming only, and always were coming mostly, from people whose idea of appropriate change over time is to still complain about Google Reader almost a decade after it happened.