I don't think we need SMTs. Yes, the code is finished. Although I have some confidence in the original implementation, I am not a C++ expert, so my confidence isn't based on direct code review. It's based on the original team who worked on it.

The blockchain itself has evolved a little since SMT was first designed. The evolution of the chain has probably not been drastic enough to fully invalidate the SMT code, but I would be hesitant to just implement it, at this point.

In fact, I can believe that SMT is dead unless there's someone with enthusiasm and expertise to shepherd it, now. It can happen only if there's someone like that to take the reigns.

If not, I would like to see the SMT code fully excised from the master branch.