I dont know what it is, but bungie have a fetish of putting people with a win streak in dramatically one sided games that are in progress.
Please just remove join in session honestly makes zero difference to the outcome of matches in this game.
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Entering a match in progress does not end your winning streak or contribute to a losing streak in either Crucible or Gambit. Having said that, it is true that Bungo will eventually pit you against a stronger team to end a winning streak… er… um… give you a better match. In the end, they started doing that a lot earlier than match 7, 10, 15 or wha’eva; you just happen’d to have powered thru it, until getting bad enough teammates… er… um… meeting your match.