It didn't seem fair to minimize the formerly majestic ability of Sword Breath into nothing but a buff for the strongest ability that Leo could currently muster as a Martial Artist. However…
Sword Breath being reduced into a convenient ability that he would likely only use when he wasn't serious was far worse!
The fact that it could be incorporated at times when he had to show his best made it so Leo didn't feel that his first journey was a waste.
'My Internal Energy isn't endless as well.'
Of course, in the end, it all boiled down to the situation at hand. At tip-top shape, Sword Breath might appear to be useless and redundant, but once Leo faced a situation where he used everything he got as Baekho, Arthur could swoop in and save the day as his trump card!
Having two different tanks of energy was more crucial than one could think.
As the superior power system, Leo's main interest was still to complete his foundation as a Martial Artist in the best way possible.