Worth pointing out: these guys worked for a long time off a very large capital-raise round to implement and run a test net, only to just replace it at the very last moment with a completely new main net.
If properly designed, the main net should really just be the test net. Any small issues should have been ratified on the test, and the chain should move to production without any issues. However, Tezos basically released a whole new product, without proper prior testing.