Are there any valid reasons of putting humans.txt? The only reason I see so far is to give credit to the team who created the site, and open source libraries it is using.
Bots will be sad when they only find a 404.
Humans will be sad when they don’t find one.
Technologies will be sad when they don’t get praised.
Contributors will be sad when they are credited nowhere.
Webmasters will be sad when sad bots create so much overhead.
No, this is completely pointless and confuses the reasons for robots.txt. The whole website by default is already for humans.
Info about who made the website already has a place in the website itself either visibly or in the meta tags. Using an unconventional magic file is not good practice.