User Brian Hoffman - Stack Overflow

why hard-forks without solid, compulsory replay protection make a PoW change more likely

Let's examine the logic of refusing to incorporate a solid and compulsory 2-way protection in a Hard-Fork.
For instance the questionable but interesting rationale exposed here by Paul Sztorc: "Been waiting for someone else to figure this out...replay protection helps only the rival chain! Helps only your adversaries! How funny" replying to Brian Hoffman (OpenBazaar) "If segwit2x goal is to become the main Bitcoin why on earth would you include replay protection. Need to kill the minority chain."
Jeff Garzik defines Segwit2X success as taking over BTC - including brand and ecosystem. But in reality, the concept of surviving chains each with a different concept of self-importance is very real, as we have seen with the precedent established by BCH/bcash. You may want to define importance as the number of double-SHA256 hashes your ecosystem is capable of calculating. But the other side of your argument does not need to agree to that, and they may well continue along with whoever wants to provide support for them.
A big roadblock to BCH/bcash has been the fact that many parts of the ecosystem don't support them, or didn't straight away. Seems like the Segwit2X proponents want to avoid this situation and aspire to the BTC brand and ecosystem.
But what will happen if SegWit2X provokes another estable chain fork, but one where both sides work right away without requiring any change in hardware/software/web wallets, and with API-compatibility with most of the existing services? (only requiring their nodes to point at one chain or the other). This changes the game by making it extremely easy to hard fork and allowing MAJOR changes we have been holding off. Concretely, a re-decentralisation of mining via a PoW change seems like a no-brainer in this new situation, as miners would go back to simply mining and be unable to hold developers hostage when trying to make development decisions.
It seems like a very direct conclusion that a non-protected Hard Fork makes a PoW change more plausible and more likely.
*typo
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OpenBazaar Developer Call - July 11, 2019

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