Not really, I think tempo does not matter here....
It's the sound.
ANyway, that's also up to individual's taste
Guess that's why I don't like Morning Musume while my elder brother's totally crazy about them (other factors are involved here...so...your theory is not 100% wrong)
I grow up liking Capsule too. Check them out, poppish and kiddish at first glance but it's irresistiable to adults' ears
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