Is “long ago” the right metric? If I propose 1 GB blocks long ago, should we change to that after a decade?

If anything we could argue the opposite. Drivechain came before Taproot but Taproot leapfrogged it, because it was less contentious.

Imo the metric that really matters is supermajority support. I resist any change, even ones I like, that lacks supermajority support, because at the end of the day, that near-immutability is the foundation of the monetary premium of this whole project.