In most competitions, I prefer rated activities (e.g., team matches or vote chess games).
However, one thing I have noticed in Season 1 of the Thematic Endgames competition is that there is sometimes a wider disparity between the ratings of the players on the various boards than in other team matches. This causes a problem because the starting endgame positions are much closer to being "drawn" than games that start at the beginning. So, aside from the pleasure of playing the position itself, there is no incentive for higher-rated players to sign up if the opponent on the same board is rated 400 points lower. It is much easier for the lower-rated player to earn the draw in the endgame position than it is from the initial position. So, the higher-rated player is more likely to lose rating points in this scenario.
My suggestion is to experiment with both a rated section and an unrated section of the competition and analyze the "rating spreads" between the various team rosters. My hunch is that there will be more of a willingness for higher-rated players to register in the unrated sections.
This topic aims to prepare the future next season of the Thematic Endgames (even if it won't start before some months). For context, season 1 was "rated", some admins expressed concerns after the parameters were announced, but we couldn't reach a consensus before the season started. Ideas was to have Open and U1400 rated and an additional U1600 unrated, another option would be to have all unrated, to which some admins expressed their preference for all rated.
Extract from today's notes (triggering the discussion):