You don't need to be a first class car mechanic to drive a car. The car still needs to be built, serviced, filled with fuel, oil checked, tyres checked etc. Depending on your skill level, some of these things you'll do yourself.
My mum knows how to change a tyre and check the levels, but she'd never actually do it herself. She's elderly and has arthritis, and her hubby is a capable mechanic. She still wouldn't drive on the rims with sparks flying everywhere and smoke pouring out the back like a lot of people seem to drive their PC.

If it's making a funny noise or keeps conking out, get it sorted. If a funny red light comes up on the dash, then get it seen to. You don't need to know why driving with no oil is bad, you just need to know the red light needs attending to!
My mum also wouldn't install a new radio, re-chip the engine or fit a body kit. If she wanted new stuff installing, she'd get a very nice person to do it for her.
If you want to treat a computer like an appliance, you can. It does what it does when you get it home. It has automatic updates enabled by default, and if you have broadband the most you'll need to do is plug in a wire or type in the password. Some people might even need help with that, but generally speaking the wire only fits in one hole and you really should know your own password.
If you want to add new features, then you need to know what you're doing. If you can't figure it out yourself, phone someone who can!
You can't "dumb down" computer-speak any more than you can dumb-down medical-speak or mechanic-speak. A doctor can't give you a prescription that says "something for a nasty tummy thing" and a mechanic can't order a new "gizmo thingy for the dash board whatsit" - they need to be specific.
I think the only needlessly complex language in our society is that used by lawyers, managers and accountants. I can never understand a word they say, and I'm sure they do it to "lock out" normal people. As to politicians, well we all know what "language"
they talk...
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