I agree. Imagine if it had no limits and that Jiraiya could turn Kaguya into a frog. Replace Sakura with Jiraiya and instead of punching Kaguya towards Naruto and Sasuke, Jiraiya turns her into a frog GG.I'd like to believe that Kishi had in mind that those with strong chakras (relevant shinobi) can counter these types of jutsu, if not logically anyone he touches can be turned into a frog.
I agree. Imagine if it had no limits and that Jiraiya could turn Kaguya into a frog. Replace Sakura with Jiraiya and instead of punching Kaguya towards Naruto and Sasuke, Jiraiya turns her into a frog GG.