In fact, collapsed answers already exist. You can do it manually and the frebies are collapsed by default. I think it would be enough to put an option in the post creation saying that you want all replies collapsed. That should take an hour for someone who already knows the code.
On Github @k00b suggested it'd be good to follow a more generic approach. Having all answers collapsed would look kinda messy in my opinion. There are sometimes interesting discussions going on in such posts.
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k00b's idea sounds perfect!
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