4) The "Bitcoin Independence Day" is only coincidentally related to Segwit. The relevance of it is rejecting control of Bitcoin by miners. Several developers attempted to re-assert miner control over Bitcoin 2 years ago with Taproot (so-called "Speedy Trial"), and it's important to remember what "Bitcoin Independence Day" was all about (and the lessons we supposedly learned) and push back against that to ensure it never happens again.