on their laptops, when they unplug the screen dims slightly and the systems switch to a more aggressive power saving mode.
your customers are not asking for it explicitly because they are used to getting it by default.
most of them won't realise what the problem is if they don't get it, they will just consider their device sluggish (or at least not as fast as the competition) if they don't get peak performance when plugged in, and they will consider the device/OS to be a power hog if it doesn't last as long when on battery power.
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