I have just read this thread with a mixture of surprise and dismay
I think it is important to consider the age of the machines that we ride and perhaps their true condition. If everything is as it should be they are hard as nails and will go on forever. Perhaps the only real weak link is in the electrics - I suspect that some of the pattern replacement parts aren't as good as they ought to be as well as some of the reconditioning services.
They do need maintaining, though, unlike modern machines where everything is sealed and non serviceable (replacement only). Will there ever be a time when people restore 2018 vintage BMWs that are a couple of generations old? Time will tell.
Steve Carter is an inspiration to me. He has had a BMW and prefers his Ariels. For some of us, that says it all!!
PS. I rebuilt the engine on my VH properly last winter. I fitted one of those wonderful Omega pistons and a magnetic sump filter (both from singles spares) and got the flywheel balanced. I have changed the oil two times after 250 and 500 miles and am currently at 800 miles. At no time has the oils shown any sign of grime - it looks clean. I think if you use good quality components and get the service of good professionals (Owlsbury Crankshaft Services) things can be quite good!