It's no more than a wild guess but I suppose Conti historically opted for a lower TPI count in order to prevent the sidewalls from being cut too easily.
Even now I still own some tubular tyres which do not have any anti-puncture belt whatsoever. They ride amazingly well and provided you avoid urban trash areas they do not puncture any more or less than a more "modern" tyre. They're not even anything special as they come with a butyl tube and are dirt cheap too.
Incredibly comfortable, even more so than a Veloflex Carbon at the same pressure. All that with a butyl inner tube.
As you would expect, that particular model has been phased out just recently only to be replaced by one that does come with a PRB which, would you believe, adds 50g per tyre. I want a gun. A big one.....
All this makes you wonder what could be made if someone really put some effort in it and build a real racing tyre. Tubular and clincher, no frills just speed.
Sure, it would be great if the impact of a PRB, TPI count and the nature of a compound could be tested thouroughly and individually but how?
AFAIK all PRB have a negative impact on weight, Crr and comfort. Most aren't even that effective to start with.
Casing's TPI, higher is better and how many times in a lifetime do we slash a sidewall anyway?
Compound? Other than Black Chili (excellent in wet conditions) I'd say keep it KISS. Veloflex's natural rubber is a fine example.
And what's the impact of vulcanizing over glueing, thread profiles versus slick?
Food for thought..........
\\RANT OFF. Apologies to rruf for the sidejacking.....