You already have a job so I'm guessing you have the practical skills needed to get paid, otherwise I would recommend sticking to one stack. Personally I feel N

You already have a job so I'm guessing you have the practical skills needed to get paid, otherwise I would recommend sticking to one stack. Personally I feel Norvig's advice wins out here, even if you just run through books to get some of the basic ideas and never build anything with the additional languages (you should though!). The point is to get out there and try new things and maybe something will get your imagination firing on all 12 cylinders and help you decide. I'm not even sure what Hickey is getting at as he's stripping out all of the things that we use to communicate between one-another about programming and putting some nebulous concept (that isn't explained) as the core of programming mastery. 'Late game' paradigms, building blocks, and platforms ARE the advanced skills!