This is your explanation.
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So basically you want to be able to be online but the game allows you to be attackable so you can still collect defenses? Not sure this is needed, I have only recently decided to attempt the unbreakable achievement. However once that is finished I will have no interest in being able to be attacked again. I like being online and not being attackable, thus this idea has only one use. Too attempt to use it during the unbreakable achievement. Otherwise the idea is useless...
As I suggested, it is an option if you desire it or not.
Most of us, try to get higher trophies by trying to def an attack or try to get that shield that you need for lets say war. This is a win-win situation for the game, because they will have players being ingame while they wait for this. So, no it is not useless.
Perhaps for you the idea would be useless but for some people defending is a big deal and very fun! I like defending because I get to see if anyone could be beat my base and to see where I could improve it but its annoying tat I have bro log out of clash to do it. Also defenses are a big part of trophy pushing if you are good at making defenses.
I love it.
So...?
Do they even check the ideas that are posted?
I like the idea, but what will happen when are attacking you, you will see the live atack or not?