If a tree falls in a forest and no one is around to hear it, does it make a sound? (1)
Figuratively you could argue that your hacks/projects didn't happen without providing documentation - or at least the documentation would add significant value by enabling others to not make the same mistakes or advancing directly on your foundation.
If you happen to have a list of thing that you always wanted to write documentation on at some point - seize this opportunity and do it.
Status of the project or even if it was a success or not is irrelevant.
As supporters of the Cult of done-manifesto we thought it needed a small addition