I was able to re-own a circa-1996/95 Norco Team ST that had benefited from an upgrade in 1998 (Sid and V-brakes). I thought it'd be this awesome bike, given I'd ridden handmade steel and Ti for years in that era. Was I in for a shock. Geometry and tubesets rooted in 1970s road bikes make for terrible bikes as compared to today's bikes. The "jewel of the 90s" was a deathtrap compared to my modern bikes.
I sold it to someone that was more nostalgic than me and I'm sure he's very happy with it.
I don't regret a single bike part I've sold or moved on from.