after answering Thomas questions, I realized that we still have a few good projects which are not very well known in the ublas community. It would be good to have a look at them again together and push the code into the main library.
- optimization of the expression template tree: https://github.com/BoostGSoC14/boost.ublas. Impressive work on symbolic manipulation of ublas expression at compile time. I think there is a lot of potential in this one too. And with C++17 and 20, I'm sure we can do a lot more.