Board Thread:General Discussion/@comment-24968221-20181228175839/@comment-5558012-20181228194521

The community ideally runs a wiki, including the creation of policies and promotion of Admin to enforce those policies. If a wiki policy for something exists and doesn't violate Fandom policy, it takes precedence over whatever you'd like, assuming the Admin/mods enforce that policy. If there's no such policy, you can dictate how "your" pages are used. Communities have a wide latitude to do what they wish (such as creation of policies over content of user pages) as Fandom likes to say Admin can block for any reason (not violating Fandom policy) or no reason at all. If an Admin doesn't want you removing messages, you are taking a chance of being blocked for doing so.

Welcome messages are generally meant to inform you of policies and things that you need to know for editing that specific wiki. Deleting a welcome message could be a strong assumption that 1) you don't care about those policies/differences and/or 2) you know all that information, thus could lead to a quicker block if you screw something up. Either way you aren't making a good first impression.

Archiving and deleting duplicate posts are different issues as the original welcome message remains.

Regardless, it's much simpler just to follow the following: Fandom policy > Wiki policy > Self.