I don't offer advice, I answered a question and platitudes like "I'm million times more productive in Phoenix than I ever was in Rails" makes my "cop-out" "a million times" better than anything you can answer.

If you're starting in 2024 and want/need to be productive right away, use what you already know.

Nobody said anything about "never learn anything new". If you have a job and other people are paying you, the expectation is to deliver, not to "learn this cool thing" and be in awe about you "journey of self discovery" while on the payroll. If you really believe you can learn a language, it's libs and frameworks "in a weekend" and forget that's just another humble brag nerds tend to tell others, then we don't even can proceed with this conversation.

Learning is good and needed, learning is hard and takes time. Respect it.