Idle curiosity: that's fair. My executive summary on that front would start with you asking a different question:
If Patrick Moore asked: "Do y'all think I should experiment with tubulars on "that Libertas"?"
then I would answer: "No, I don't think Patrick Moore should experiment with tubulars on that Libertas. They are not objectively "way faster" or "way smoother" than the best modern clinchers"
What Patrick Moore actually asked in the initial response was two-fold:
Is it true that modern supple clinchers can roll better than equivalent tubulars? I believe that they can
With tubes or only tubeless? I believe with tubes and without sealant is currently considered "the fastest".
I could write many pages about my story of sew up use over the last 40 years, but I'll cut to the chase that my use of sew ups today in 2024 is purely because it's cool. I've got three sew up wheel sets in my garage at the moment, ready to be put into action. Even the new pink Roadeo has a sew up option. Sew ups on a cyclocross race build is just cool. It's not better. It's not faster. It's just cool. The particular reason I put sew ups on my Legolas was practical: I was building my Roadeo, experimented with a wheel set which was supposed to generate better braking, which instead generated horrible braking. I could "fix" the Roadeo by inheriting the clincher wheels from the Legolas. I found cyclocross sew ups on eBay for crazy cheap. So the Legolas became more cool (in my eyes) and the Roadeo was permitted to become a bicycle. I've only ridden the Legolas ~20 miles on pavement since the sew ups went on. It's the same bike, only cooler.
I do not think Patrick Moore's cycling life would be enhanced by experimenting with sew ups, unless Patrick Moore decided to consider sew ups "cool". I do not believe there is any objective case to be made to prove to Patrick Moore that he must try sew ups. Not speed, not comfort. The physical act of glueing on a tire is a maneuver that I suspect Patrick Moore would find frustrating.
Bill Lindsay
El Cerrito, CA