[jbooth]

You're right regarding larger system architectures where it's more about the services and less about what language each is written in.

1) Regarding concurrency, Go really pushes you towards writing things in a scalable way with the goroutines and channels, while still giving you mutexes for when those are the best fit.

2) Regarding single-threaded performance, this does indeed start mattering once you un-bottleneck-yourself on the architecture and concurrency fronts. 250 boxes are cheaper than 500.