I've had two OEM brake line failures, my '81 R65 had a failure at 10 years of ownership, my oilhead at 11 years .
The R65, I found before I rode it, the oilhead line failed in heavy rush hour traffic at 65 mph, about 110 kph .

The lines on my '81 R65, were just rubber, no fabric reinforcement, or liner in the line, the oilhead line was about at best 2 mm thick hose, no reinforcement or liner .
My '87 Guzzi, the original owner bought it from the dealer in '91, one of the front lines failed in '97, he replaced them with braided stainless lines .
In my experience, I don't trust OEM rubber lines, when my cars are out of warranty, they get braided stainless lines !!! 8-)
But, in my situation, the incessant heat of the low deserts of south central Aridzona, is not kind to rubber and plastic components either, I live in one of the worst case scenarios for vehicles !!!

But, it is a ' dry ' heat !!!!

And I tend to keep cars a bit longer than the usual person, I've got one going on 38 years, the next one, is 17 years .