I hear you Two things I wonder however
How many modern semi's will be still pushing out rounds in 25-40 plus years as my batch of super x1's still do. Too many alloys and plastic IMO to do so in modern firearms
I also remember buying 4 browning gold semi's new in the early 90's and still have them 2 12ga , 2 10ga. They were everywhere in duck blinds and a hell of a gun for years but now I don't see too many and I wonder what happened to them. I have also the winchester x2 and x3 which are also good guns but not built as well as the original golds again see X3's everywhere but few x2 now
On the pumps honestly I have a new wingmaster in fact a couple of them and a new ithaca 37 and both are pretty dam smooth to the point hard to tell a difference from the vintage ones of which I have a lot of in all makes and models to compare them against
Smoothest pump I own are my rem 31's swear the action was on ball bearings
Some guys collected hand guns me pump actions and semi's

Cheers