I don't know how many matches I lost because the rules (cap ABC or kill all enemies) cease to exist at some random point later in a match. There is no warning, timer, nothing. This never happens in casual firefight. State the rules clearly. Inform the player when the overtime starts.
The exclusion of kill feed to encourage communication does not work and will not work - it only frustrates tons of people who don't have a mic or cannot use it.