I do believe that learning many programming languages is overrated Learn concepts, obtain foundational computer science knowledge, write complex projects not just get familiar with somebody's interpretations that they implemented as a language. Languages that I used besides my job language barely gave me anything, in most cases they made me appreciate more for sane environment (package managers, IDEs, debuggers, stro…
Charlie Watts wasn't just into jazz, he was into all music. George Harrison understood that jazz could deepen him as a musician, but found Indian music.
If one wants to write a language that is truly original, that might actually influence the future, not just smearing around familiar weightings for features found useful "in the trades", then one wants to have some grasp of languages representative of every language in use. Then, only proceed with a compelling vision of what's missing.
For the rest of us, being a language junkie can be a problem. Without being judgmental, it is possible for a person to be too promiscuous. Same with languages. I wish I could just stick to Haskell and get work done.