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they're as meaningful as they purport to be, which is not all that much, which is why they are provisional.
Actually I find it useful to see how the new players are doing, and perhaps challenge on if their rating seems too high :)
Also if I'm playing a new game it's kind of fun to see some sort of rating early on. It makes no difference to the end result so why hide it?
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)