The constant shilling for Julia gets old after a while. When it comes to numerical mathematics the implementation language is just a way to express ideas that are more or less independent of whatever language you are using. Last time I checked Julia had close to no professional grade libraries for PDE solving , while there are multiple deal.ii, FenICs, petsc high quality libraries for C++. Don’t get me wrong Julia is great, but what really matters is the quality of the available libraries. The differential equations work in Julia is nice and obviously the resulting code is performant, but a ton of work in numerical mathematic is spent on adapting methods to specific problems and at that point C++ feels like a much nicer choice to me in many cases.