I think not wanting to play slow players is the biggest issue. Some unknown circumstance that forces a timeout is not that likely.

My biggest problem is with tournaments that finish except for one player. Then it sits stagnant for ages waiting for that player to finish the games. Tournaments are fun when they move quickly and you can maintain the context, and eventually get a winner.

On tournaments, can I suggest a 6 games match at the end instead of 3 wins. 3 wins can last forever with a game that draws a lot.