Yes of course and for my own personal projects I will take the time often to learn new languages (e.g. Rust). However when dealing with a team often with an ex

Yes of course and for my own personal projects I will take the time often to learn new languages (e.g. Rust). However when dealing with a team often with an existing code base getting everyone on board with "X" while potentially porting to "X" is fairly expensive. Its generally only worthwhile because of actual technical limitations and not productivity. Even the promise of safety (ie prevention of bugs) I would probably consider higher than productivity (although I suppose that is in way productivity). Regardless productivity is really hard to measure and especially predict unlike other technical things.