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What are some other examples of self-imposed constraints leading to step-change innovations in the world?
Stallman constrained himself to only use free software. 40 years later, we're still struggling (esp. around drivers) but free software changed the world.
What is it about constraining oneself in the short-term that leads to so many world-changing innovations?
In short you get credibility that is difficult to obtain otherwise. In the Stallman example, look at how he couldn't be cancelled from his FSF seat because he makes the seat important, not the other way around. That's what credibility can do.
What other constraints should Bitcoiners be embracing?
Hmm... how about not whining about L1 being clogged? We want hyperbitcoinization, right? Sky high L1 fees are inevitable in case of hyperbitcoinization, so use those L2s already.