Depends who you ask really. If you are a developer then you should invest your time and be able to learn and use the best tool for the job. If however you are

Depends who you ask really. If you are a developer then you should invest your time and be able to learn and use the best tool for the job. If however you are something like a Product manager then learning JS is much more valuable time investment. It is the one language that will, currently, run anywhere ... Backend, Frontend, Side end, whatever. You can quickly get good at JS to the point of being able to prototype the full app stack and come up with something that works, goto market and fail. Should you find your self in the unlikely position that your product meets its success, then you can go ahead and hire a Go/Elxir/WebASM whatever guy to optimize this and needs larger throughput. You have 24 hours in day, 6 to sleep, 3 to breath, 1 to eat. How do you want to spend the remaining 14 ? You get good at what you practice :)