> We think that smart contracts are only a subset of use-cases and should only be used when needed vs. making smart contracts the only way to program decentralized apps

Totally agree.

Great job with blockstack, the APIs seem real easy to use - only thing I'm worried about is that the mobile SDK's are just JS wrappers so the JS bridge might be a speed bottleneck in mobile apps. Also, are there plans for a Flutter SDK (pretty easy to make a wrapper for both platform SDK's)?