Hello TimFreeh
My response is very long.
I tried to keep it as short as possible.

This is what automotive Engineers call a SAFETY issue.
The brake flex hose on any car is durability tested to roughly 125% of vehicle life, current production domestic cars = ten year 125,000 miles, in real life, things happen that can reduce or extend the life of a flex hose.
Rolls-Royce states in the owners manual on all post WW2 cars that the hose life is eight years and lists the flex hoses as a regular maintenance item.

On a car with ABS brake system.
One or more failed flex hose can:
#1. Act as a one way valve. (Caliper hangs up and warps rotor.)
#2. Act as a restriction. (Massively reduced flow to one or more caliper overloads the other calipers, overworks the ABS and warps rotors).
#3. Act as a plug. (Total blockage of one or more caliper, overloads the other calipers and warps rotors).
#4. Destroy the ABS distributor and/or pump slowly. (Overworking the system at all times, not designed for full time use, drastic reduction in life).
#5. Act as a terminal failure;
Final failure mode can be:
#A. Hose seals shut with MAX ABS pressure on caliper during a panic stop, and never releases = brake pad drag + possible fire.
#B. Hose weakens to the point that it ruptures = 50% brake system loss, odds are during an abrupt stop.
#C. Hose seals shut with NO pressure on caliper during a panic stop and you loose 1/4 of your stopping ability.
#D. Cause the ABS distributor and/or pump to fail when you need it most.

This can occur at any time.