I'm not sure that the current situation is bad, seeing users creating duplicates in Bugzilla because a task has already been fixed in the codebase but not deployed yet or WONTFIXed/declined.
So it's not unnecessarily noisy to me, it's maybe just what you're used to as a power user. :)
Note that users can change their default via https://phabricator.wikimedia.org/search/query/edit/ , by placing their preferred query on top. For instance, I have "Open Tasks" by default.
That makes sense too. Proposing to decline this request, then.
For what is worth, I have documented how to customize your default search query at https://www.mediawiki.org/wiki/Phabricator/Help#Defining_your_default_search_parameters
As per T885#15740 and the given options in T885#24234 I'm closing this as declined. I haven't seen any other complaints about the default behavior.
Different types of users have different needs, they can be set up by following https://www.mediawiki.org/wiki/Phabricator/Help#Defining_your_default_search_parameters