Great! I'm talking about experienced developers like you, who know what it takes to be productive/get things done. First you learn grammar and semantics of so

Great! I'm talking about experienced developers like you, who know what it takes to be productive/get things done. First you learn grammar and semantics of some new language, then you want to build a product. From your past experience you can tell what's necessary for solution to be successfully created (all the things you mentioned and some more). Make it a list, evaluate, revisit your best choices as you go. Once you find yourself happy in the new environment, you're in a position to more accurately determine which of the tools now is better for the job.