If you run a non race cam, there is not as much adjustment on the cam and lifters. I have 300,000 miles on a 67 273 cam and lifters. They still look good.
That's what I've come to understand. A lot of modern OHC engines use solid tappets with the only adjustment being from replaceable lash caps and they only need to be changed during a rebuild, and at that usually only when changing to a bigger cam and/or installing new valvetrain parts. Buddy just went through it on a Ford 2.5L Duratec I-4 he swapped into his NC Mazda Miata, this is stuff made in the 2010s.