Uh...for the record, the TR6 engine has absolutely NO relationship to a "tractor" engine. That's a half-truth that relates to the wet-liner four-cylinder used in the TR2-4, an engine originally developed for the Standard Vanguard but soon also developed for the Standard-built Ferguson tractor. The six has its origins in the 803cc four-cylinder introduced for the Standard 8 saloon in 1953.
Fact is, pretty much all the classic British roadsters were stuck (if you will) with long-stroke engines derived from family cars. Of course, cars such as Jaguars beginning with the XK-120 are notable exceptions, but that's an entirely different class of car.
That particular topic aside, I really don't understand your blanket condemnation of the TR6 and their owners past and present. If you think the basic car looks cool but is better for you with a more modern drivetrain, etc., that's cool. No different than thousands of folks over the years who love the basic look of a Model A Ford roadster or any other car but customize the look and/or stuff in big-block Chevy or other engines, etc. It's called hot-rodding. But to arbitrarily state that the basic car sucked then and still does now, and that nothing can be done with any parts available to make and keep it a functional "stock" car? Utter nonsense, and you know it, and pretty much everyone else in the hobby knows it.
Are there bad reproduction parts out there today? Absolutely! Are there good reproduction parts out there today? Absolutely! Same goes with original parts v. aftermarket replacement parts back when the cars were new, but to a much lesser degree. Back then, the parts market might well have been supporting 50,000-60,000 extant TRs (and other cars that share various parts). Now? I dunno, maybe 10,000-15,000 still exist, if that? Economically, a less viable market, but ultimately (I hope) a more discriminating one that won't long tolerate poor quality.
My bottom line? I don't think anyone is "wrong" here for what they like in their cars and in what they do to their cars to keep enjoying him...except YOU, apparently convinced that all the rest of us are fools.