Ah only problem is that what Naruto just learned.. almost every medical ninja is capable of it.
For someone else to use your chakra, you must have the ability to adapt your chakra to theirs.. Sakura already did it...
Naruto can do it on a higher scale because he has higher chakra.. However, if you notice cloaks don't have a balanced chakra, because he lacks the control to make it balanced.
if you look throughout the hole manga so far everyone with the chakra cloak is balanced, it only became unstable since naruto is near his death bed and other times he was exhausted.. this about how much chakra he gave to how many people and he has to maintain each one of these.. plus the fact he increased the chakra to each person as a form of defence when again madara and obito shows another feat
Also as others have been saying the fact Naruto has learned how to use sage mode with deformalities shows his chakra control to a great degree since without the ability to balance all 3 types he would have turned into a frog.. very few can do this.. and very few have sage mode
where as there are a lot of people who can perform medical ninjutsu just like sakura.. if anything the argument you should be using to show sakura's chakra control should be the seal on her forehead since only tsunade and sakura have it.. well .. apart from mito by the looks of past scans... but thats all
i will agree sakura's chakra control is great and it always has been but she isnt exactly stomping naruto in that area since he has to control a great degree of chakra