Just on the commentary, one of my favourite calls was Dennis Cometti's 2012 "Is that the Grand Final? Sydney are premiers!" and I doubt it comes out like that if there's no countdown clock. Just the stamp of it all to go with Malceski's celebration made it pure adrenaline.
Sure, no countdown clock gives you one context of excitement in having the unknown. But generally, you have an idea that the siren is likely to go pretty soon. The countdown clock gives you a different context of excitement. An example being West Coast beating Port in 2018... under a minute and the Eagles still needed 2 goals to win. Countdown clock meant a lot of us thought the game was done, but they get a goal with 3/4s of a minute left and then get a mark right before the siren for an after the siren shot at goal. The countdown clock actually added a different contextual excitement of pulling a win out of an almost probable loss. No countdown clock means that sniff of hope continues, even though you know not much time is left, there could be another minute and a half to score a goal.
Countdown clock doesn't detract or add in a specific volume of excitement. It's all contextual and comes down to personal preference. Ideally, we'd have coverage that offered both options and an option to watch with no commentary (or even different commentary to the different clocks) and everyone gets their preferred way of viewing the game. But highly unlikely that happens until all games are exclusively streaming, and even then, will the rights holder be innovative enough to provide these options? I doubt it.
So you guys have the gaffer tape and sound down workaround in the meantime.