It's not "easier to ignite", it's hypergolic. The two components spontaneously ignite when they come into contact - so you don't need to worry about an ignition

It's not "easier to ignite", it's hypergolic. The two components spontaneously ignite when they come into contact - so you don't need to worry about an ignition system that can reignite the flame in mid-flight, making the whole system safer by eliminating components. All you need is a pair of pumps and two valves: Open valve - burn, close valve - burn stop. (grossly simplified version)