This is becoming interesting and I am pretty sure it will be harder to defend if people start planning ahead, but maybe you can have a feature to "pay for holiday mode" for those who are busy with something in the real world that can't have their phones with them all the time.
And with a limited time frame. Expenses based on production and resources.
The bigger your stackpile the more expensive your purchase for holiday more will be.
Hope you can consider on that feature. Haha
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This. People need to sleep and most need to work too. Careful surveillance of a players schedule can reveal this to botmasters that can take advantage of a player being unavailable to secure their base from attack while AFK.
This is a very real issue and particularly in view of no post-battle shield.