What do you mean ease of writing it off....??? Higher tensile strength and lower weight.....?.....
And im pretty dam confident manufacturers didnt avoid The flagship tubeset for fear of warranty claims either......
Just pointing out they did later briefly use 753 for some race machines (1991) so highly unlikely they'd used it off-road before, let alone sold it to Joe Public to bash against trees and rocks.
Repairing thin high-strength heat-treated tubes is a bugger, so the chances of an off-road spill writing off a frame is quite high. The higher-strength of steel (PER SQ INCH) allows the tubes to be made thinner/lighter, it doesn't necessarily make the overall tube/frame much stronger/stiffer than 531
It arguably does make the frame more fragile when abused.
If the frame was built too strong/stiff it would be bone-shaker and heavier than necessary... What did Colin Chapman of Lotus say: "Any car which holds together for more than one race is too heavy"
All this talk of materials is forcing me to relive the materials part of my degree, which I'd mostly forgotten having gone into IT, anyway back on topic, kinda...
The only other one in this size I ever saw was the one hung on the wall of Fleet Cycles in 1989
If it was hanging there in October 89 I probably saw it too! All I remember was lusting after a Scott in the window with spare spokes on the chainstay
My dad insisted on a lugged frame though, after my lugged Raleigh racer saved me in a head-on crash with a car