It's still impractical for that very reason, but unlike Jiraiya, Naruto--being a senjutsu prodigy--seems to need progressively less time to prepare Sennin mode. It seems that at this point he barely needs a second of stillness to enter Sennin mode before whipping ass.
And as was said, fuck yes Sennin mode remaining relevant. Now all he has to do is develop some more futon jutsus, get another badass cloak, and then it's "like a boss" from there.
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