> If I fully deplete the battery. I cannot immediatly turn it on with adapter's power. Why? Every windows laptop can be run with adapter even with a dead battery.
First you should not be depleting modern batteries, its not good for the battery health, or indeed storage health, recall that solid-state storage integrity is not guaranteed in the absence of electrical current (a reminder to those who have a habit of backing up stuff onto SSDs, unplugging them and forgetting about them for extended time periods).
Second, if you think about it, its a safety feature in to protect you from data corruption.
If they let you turn on a machine with a fully-depleted battery and you immediately yank out the power cord, then you risk data corruption.
Sure, modern solid-state storage (at least the high quality implementations) have power-loss-protection. But that relies on capacitors. And to charge up capacitors, you need what ... oh yeah, that's right, electricity .... ;-)
So that is most likely why Apple require you to have a minimal charge before allowing you to power-on from completely depleted.
And to be honest, what are you bitching about anyway. Most Apple devices I use only require a 5–10 minute charge from completely depleted to get you to the minimum required. So just go make a cup of coffee and remind yourself not to completely deplete batteries in the future.