Putting all the success in terms of "rewriting" is as misguided as accounting it all on the technology change. I have seen rewrites using the same technology fa

Putting all the success in terms of "rewriting" is as misguided as accounting it all on the technology change. I have seen rewrites using the same technology fail due to scope issues. I have seen rewrites fail because they could not master a new technology. It is easy to paint everything with ones or zeros but it is most likely a combination of factors. A team with more knowledge of the domain, a management willing to try new technologies and a technology that excels at concurrency, which seems to be the problem they had at hand, sounds like a good combination for success.