User deletion of posts
While I generally agree that a player who provides consent to a thread should have the right to delete a thread they post, I think that there comes a point where “public interest” (for lack of a better overarching term) trumps that right.
As an example, if a player posts a thread suggesting a change that gets a lot of upvotes, a Rioter responds with the internal reasoning as to why they choose not to make that change, the thread has likely already been catalogued by Google and other search engines. The Rioter’s response may very well provide valuable insight that would be lost if the thread is lost.
The recent case (will not reference exactly but the moderators should know, is a prime example. The Rioter’s response provided valuable insight as to how they evaluate cases of trolling/griefing that aren’t obvious enough for the automated system to evaluate. However, those responses (or at least the verification that they came from Riot) are lost now as the thread was allowed to be deleted.
My suggestion is that a player who deletes a thread that has a valuable Riot (or community, but this is rarer) response should have the thread undeleted, the thread should be locked, and the content of the original post (and any quotes of it) replaced with a statement stating that the OP has requested the thread be removed. This has a precedent in that when a comment is deleted, replies to it are not.
It’s not fair to the community or the boards to allow valuable insight to be removed just because someone regrets posting the prompting thread.