That's not at all what I heard in the parent comment. It's not that tinkering with programming languages is bad at all. Rather, what OP proposes is a veritable shitton of work, and really won't be as much fun as he imagines right now; it'll be work. Hard, hard work, with tons of organizational overhead. If OP wants to do work of this caliber, the parent comment suggests that OP first seek out more productive, equally exciting and technically challenging ways to channel that energy.
That's my interpretation, anyway. Not that hobbies are bad, but that this is gonna be a life-consuming hobby, will likely detract from other pursuits, and may not pay off as well as OP thinks it will.
That's my interpretation, anyway. Not that hobbies are bad, but that this is gonna be a life-consuming hobby, will likely detract from other pursuits, and may not pay off as well as OP thinks it will.