Slotted power strip should be how all power strips are designed

Slotted power strip should be how all power strips are designed

This ingenious power strip design swaps out holes for slots, allowing you to slide your plugs right up next to each other, saving all sorts of space. Why hasn't someone thought of this sooner?
Sure, sure, if you have any three-pronged plugs this thing will be pretty much useless. But why not combine the two ideas, with a couple of three-pronged outlets on one end and a slot taking up the rest? I don't know, I'm no designer, I just know I've run out of room on power strips enough times to wish I had a clever design like this.