Developing blockchain software with D, not C++

[aberba]

In this video[1] from 2016, developer talks about C++ memory 
safety features, meta-programming, maturity and few others as 
main reasons they choose it for developing their blockchain 
software (the way I got it from a quick view).

Besides, D maturity (which I can't confirm or deny), what else 
does D miss to be considered a better alternative for blockchain 
in 2018?

D is also more productive, has safety and unittest built-in.


1. https://www.youtube.com/watch?v=w4jq4frE5v4