This talk of old race bikes being too stiff is slightly ridiculous. In my experience they're also likely to minmax into light weight and be quite pleasantly noodly, even in the late 90s, and i've had late 90s bikes that i've loved the ride of.
It also heavily depends on what size bike you're looking at. There's a line in the sand between 56 and 58 where you're far more likely to get stiffer tubesets for big lads and whether that suits you or not will depend.
I have done a lot of riding on maybe half a dozen high end classic steel bikes and don't really feel qualified to make that many generalizations. I can talk about each one but it still feels quite random. I say just take a chance on something you like for other reasons.
I'd only trust generalizations from some boomer who had ridden hard their entire life and been through dozens and dozens of bikes and even then.
>>1941222what the actual fuck are you talking about this whole post is chock full of nonsense