I don’t know about the specifics of the implementation, and I don’t want to debate about which preset settings should be the default for such games.
However I have heard/read this a good bit recently, that the community/matchmaking is somewhat split and feels that way between custom game list and automatch, and naturally splitting the pool of players up makes getting a game harder (with specific settings) in one or the other or both.
I think a certain (probably large) amount of people do prefer hosting custom matches, and it was suggested before to just show the automatch queue as games with default settings in the custom games list. That way someone who is looking for a custom game, and doesn’t usually use the automatch can still accept to match with the automatch queue provided they meet the requirements (usually rank say).
post about long waits for correspondence games with the automatch