Yes it does, changing high chakra amounts to suit different people and giving them this chakra with just the slap of the hand is great chakra control. Modifying chakra is chakra control, you're controlling your chakra and making it comparable to another's chakra and Naruto was doing this in seconds. If it was not a big deal then Kakashi and Kurama wouldn't have praised it as they did, Kurama said he surpassed Minato and Kushina.
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Also Naruto is still maintaining the chakra he gave everyone while he fights, Sakura was only focusing chakra there but wasn't doing so in the heat of battle as intense as the war. He real only fight was against Sasori with Chiyo helping her. Everyone of Naruto's training had to do with a form of chakra control so he only kept getting better while Sakura's was only her walking on tree, learn to break genjutsu, walking on water and healing, summoning and seal shows her chakra control while Naruto has learning Shadow clone, walking on tree, walking on water, learning summoning jutsu, rasengan, learning to control Kurama's chakra with Jiraiya, learning to break genjutsus, Oodama rasengan, learning wind element, learning rasenshuriken, SM, training in KM and sharing chakra are all chakra control.
Sakura was storing up chakra, she needed to save it over years to fill it up as Sakura said it was filled now
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. It's precise chakra control to focus it in one spot which is what Shizune said and admitted she couldn't do. Storing it up wasn't the problem since you're adding chakra to it, it's the focusing the chakra in a single point. Tsunade had it stored longer. All of Naruto's trainings had to do with a form of chakra control so he only kept getting better in difference fields of chakra control. Naruto learning to use wind element was a type of precision, he had to cut leaves with it also learning to use the precise amount of chakra per jutsu is also precision, Sakura was praise on having great chakra control because of that while Naruto was poor at it. Naruto got better at it after learning to walk on water.
Tsunade made it and taught Sakura it, only Shizune was taught it and fail to do it so it's not that special when the teacher of the jutsu is also the creator of it.
It's in the same category as the Rasengan and Chidori. Naruto needed to focus chakra at a single point in his training on the 2nd step and Kakashi said you have to focus the chakra in the palm of your hand then add lightning chakra. So focusing chakra is shown in other jutsus, Sakura only saved up chakra over time, Naruto or someone with a lot of chakra can fill the seal up in far less time and use it. She didn't save it that long, she was storing it up and it didn't fill until she used it. I'm not hating on her but it's a super high rank jutsu to single it's chakra precision out when Naruto and Sasuke learnt A rank jutsus of high chakra control as 13 year olds. Now Naruto has Giant Oodama Rasengan which is even more focus and concentration.
