Hyuga Yu had been contemplating how to use Wind Release: Chakra Mode for many years.
At first, he had planned to follow the conventional applications used in the ninja world:
Using cellular activation to enhance mobility, creating an invisible Wind Wall around his body to protect himself and block incoming ninja tools, while manipulating the wind's shape and nature transformations to form mid-range attack patterns.
These were all easy enough to imagine. As long as the corresponding difficulties were resolved, developing them would not be hard.
For example, The C-rank [Wind Release: Net] that Hyuga Yu had created in front of himself when he killed Yumiko, And the B-rank [Wind Release: Vacuum Blade] he had used against the more deeply concealed spy behind Yumiko, condensing the wind around him at extreme speed and further increasing its power and attack range.
Beyond that, Wind Release: Chakra Mode could also be expected to grant high-speed mobility.
But after Hyuga Yu had fully mastered the shape and nature transformations of the wind attribute, he suddenly realized—
Those were merely superficial applications.
There was naturally nothing wrong with developing them further, but that would place greater demands on the caster's chakra reserves.
The Fourth Raikage Ay was not so powerful because his Lightning Armor was especially exquisite, but because his chakra reserves were on the level of a Tailed Beast. (PS: See the Five Kage Summit, the chapter where Karin marveled at the Raikage's chakra reserves.)
With chakra at that level, any technique he used could unleash power unimaginable to other ninja.
Hyuga Yu did not have that much chakra for now. If he wanted to prolong his endurance in battle and improve his combat strength in higher-level fights, Hyuga Yu had discovered a more fundamental parameter that Wind Release could subtly alter—
Resistance.