> That said as a few other people pointed out, the key is iteration, hot-reload and other things. Given the choice I'd probably do(and have done) a Rust based engine core where you need performance/stability and some dynamic language on top(Lua, quickjs, etc) for actual game content.

I fully agree that this will likely be the solution a lot of people want to go with in Bevy: scripting for quick iteration, Rust for the stuff that has to be fast. (Also thank you for the kind words!)