Tunneling it's cool, the game was a nightmare. Just gotta keep an open mind about it honestly.
As for the Q, well it's mostly because we don't have enough players to run games concurrently. Long ago we used to start a second game when about half the players died in the running one, but given how little players we have now it's not a good idea. Plus there's been a few occasions where someone had to hold their tongue because they know someone is mafia (and alive) in another game, but they can't say anything because that would hurt the other game and be considered a leak.