I'm curious why ヌケヌケ was changed to 抜け抜け. According to the Google Japanese n-gram counts, both ヌケヌケ and ぬけぬけ are more common than 抜け抜け.

ヌケヌケ looks strange to me.

Actually, I didn't know ぬけぬけ could be written as 抜け抜け, but I feel it looks better if it is written with kanji. It's just my preference.

The major Japanese-English dictionaries don't even have the kanji form. FYI the n-grams counts for the forms are:
抜け抜け 4222
ぬけぬけ 17110
ヌケヌケ 7632
Since this sentence is the only one using this term, I think it's important/useful to have a kana example available. I will add another to fill the gap.

I think some people tend to use words in hiragana even though they have kanji.

When I see hiragana words, it feels soft. Sometimes I purposely use words in kana instead of kanji. I won't being strict with kanji, so it would be good there is another example. :)

I think I prefer kana for things like this (sort of like onomatopoeia).
Somehow, to me, it looks more natural.

Kana give a softer, almost cuter feel, while kanji give a more sophisticated impression.
I prefer kana for onomatopoeia because by definition it's a sound, and I see kana, especially katakana, more often than kanji for onomatopoeia. And in my opinion/impression as a learner, by using the kanji, it almost shuts off the reader from understanding it without knowing the onomatopoeia itself AND the kanji for it.
Then again it depends on the style/personality of the writer and what ratio of kanji they use and who they're talking to and what kind of message they're trying to get across.
At least that's what I think I know.