[zackyap]

For modern startups, growth can be optimized on an ongoing basis but not if you're not building something that people love. There's a reason why Zynga games' growth aren't sustainable and they need to rely on the novelty of games to grow.

I'm sure even Blizzard and Steam teams are very focused on growth as a metric. It's just that unlike Zynga, they believe that creating fun mechanics in their games and improving on them through patches make for a great way to move their needle. Therein lies the difference. I guess the focus shouldn't just be growth at all cost, but sustainable growth.