> tomorrow’s happiness is just as important as today’s.

Aye - I agree with you. The point I was trying to articulate: hobbies with linear returns traded tomorrow’s increased happiness for today’s happiness.

Hobbies with compounding returns still get me today’s happiness! But, after investing in that type of hobby, tomorrow I’ll be capable of more “hobbies” than I am today. Especially when hobbies begin to cross-over (I.e. chemistry and glass blowing)!