I see we can set a Financial Type as "Reserved" with a checkbox. What does that do, and does it set that flag automatically on the associated accounts?
'Reserved' on items like this in Civi indicates that it's something that you don't want to be updated or deleted, as it's an important item. So non-admin people can't update or delete it - in this case you have to have the 'CiviContribute: access CiviContribute' permission to be able to update. Groups and tags can be protected in a similar way.