there's a long literature of:
- why even VCs diversify bets
- why working on side things helps your main thing
- how Nobel prizewinners are 3x more likely than the average scientist to have creative hobbies
- https://hunterwalk.medium.com/why-a-paid-newsletter-wont-be-...
and so on. i didnt say that having 4 things is spreading yourself thin. its just a really unscientific thing to assert without proof that having only 1 thing is "the key to success". so i push back on it.
Besides far fetched hypotheticals I can't think of a reason why somebody would say spreading yourself thin is the key to success.