wait bitcoin Core is not backward compatible? meaning the Satoshi version won't work all at?
Discussion
The explanation is long, better read this article to understand what happens.
got it. so the taproot now is another segwit story of "we are not forcing you but you may not fully function if not upgrade to latest" yes?
I could not answer correctly because it is something more complex, although it is as you say, the problem is that the Bitcoin Core team does not maintain older versions of Bitcoin Core without the new features, therefore gradually force you to migrate to new versions because if a security flaw arises in an old version is not remedied.
I believe #[4] cares most about backward compatibility on nostr, what's your take on the bitcoin core sir?