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Why shouldn't electric plugs screw in?
(programming.dev)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
They screwed bulbs in and out before light switches were invented. Switches are better.
As for the plug, pretty sure you had limited plugs. You had to plug in one device, and then unplug it and plug in the next. Ava you likely wanted to unplug when not in use. You wanted it tight but not so unwieldy that it was a pain. This was a good design. Never really had a problem with them coming out. The grounding plug which came later helps make it even more secure.