As complicated as the new stuff is and old stuff not being as plentiful, I’m amazed at times how these parts stores make it.
Other than some lines for hoses and routine misc. items, I rarely buy anything.
My stuff has to come from online places like Amazon, Kaiser-Willys, LMC, and the like.
I hear you.
I used to have my own boring bar to do my overhauls did it all the time. The last six cars I bought I haven't even opened the hood. I replaced absolutely nothing on those cars. Oil changes are now done at 10,000 we used to do it at 1,000 things have changed.
Of course these light weight cars have a lot of road noise so I miss some of my older Cadillacs and Town cars. [:-)