I think this idea makes a lot of sense because of the fact that the ___used names would still be technically correct and could still be used to refer to the tiers in an "unofficial" capacity. Changing everything to _U in analyses and articles and on PS and whatever else removes a lot of the "need" to have abbreviations for new tiers as it lets you be consistent across the board (aka getting rid random inconsistencies like this) without actually getting rid of any tradition / alienating people who are used to the current names / changing a large part of the "image" of the site. It also solves the "omg how can anything be used less than never" issue completely, as well as the need to try to scramble for names that make some sort of "sense" when naming new tiers below PU. Basically it just solves a few of the issues brought up in the thread without radically changing anything.
(on a side note, it's probably just personal, but i think "poorlyused" and "partiallyused" sound really stupid lol)
(on a side note, it's probably just personal, but i think "poorlyused" and "partiallyused" sound really stupid lol)