While i agree with you that overtime was fun, this change actually goes a long way towards balancing attacker versus defender win ration on siege.
Before attackers won way way more rounds in general, after the change i feel its a bit more fair.
A proper defense can hold for long enough and attackers cant "crutch" by getting one turtle on flag to force overtime.
Now on some maps its easier to defend first round, instead of the previous attackers always(nearly) win first round.
Maybe if its possible to have overtime, yet if flag is at the bottom and all attackers die, defenders win(instead of how it was, that attackers got the "bug win")
That might satisfy ya all.