I’m obsessed with user experience (UX). Customizable default actions are an important aspect of UX. I call all defaults operations combined, the “defaults system”.
One application of defaults is folding. I love it that folding is now persistent.
To make folding an even better experience, there could be an option to save the default folding state of the page.
This way, if I chose to fold or unfold all at some point, I could easily revert to the default.
There could even be a shortcut for this operation.