As I said in another comment, there seems to be a battle between extremes. On one end, the "complex" C++, Scala and others. On the other, simplistic stuff, such as JavaScript, Go, etc. It's probably gross injustice to put Go and JS in the same category, so I apologize, but for this argument, let's over look it. I think Swift and Rust are a good middle ground here.

With your large project, in hindsight would you prefer Go or C++? At least with C++, you can go as complex as you want, or stop and set some "rules" that should not be passed. But I err on the side of having the option rather than being restricted.