lots of reasons, but around that time etsy invested heavily in infrastructure and tools like statsd resulted from it.

the last few years the focus has been mostly on product, and product teams usually don't produce the kind of significant technology contributions you're talking about (huge generalization there obviously).

this is more of a personal opinion, but my experience was that the last few years etsy has focused less on technical solutions to problems and more on "people solutions" - if something is inefficient they look for non-technical solutions to that problem, sometimes fruitlessly. as you can imagine in that environment, things like statsd don't get made.