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A brake cable is far easier to find in some backwood town than the correct type of hydraulic fluid and a bleed kit...and personally i'd rather change a brake cable in the middle of nowhere than bleed brakes

It's a fair point, but one might equally point out that brake cables are much more likely to fail that hydraulic hoses, so it makes sense to balance MTBF and cost of failure. Your frame will probably break before your hoses fail.