As someone who worked in a large OEM company releasing tons of smartphones, I'm actually impressed it only took 100 people to getting this out. I presume there was an incredible amount of sleepless nights, as this is no easy task.
To be fair though, Sprint is one of the easier carriers to work with after T-Mobile. I can't imagine them releasing a phone on AT&T or Verizon, as their process is grueling. I guess since they're selling an unlockcked version of their phone, it doesn't really matter to power users. However, most sales for smartphones are from contracts sold directly from carriers so it'll be interesting to see how they'll do in the market with their current strategy (similar to One Plus One).
Props to them though. It's not just about carrier certification. Releasing a smartphone is a long complex process. Some engineers at Sprint were briefly talking about how great the phone was, so I have high hopes.