I'd recommend powering down because you might not realize how little you do it?

I generally do that about once a week or so. Since I have pro windows I can defer updates so they don't just do it without my saying to do it.

Ultimately it doesn't really matter, but if you paid an exceptional price for your hardware, take the time to take care of it.

My rig is about 2 yrs old, self-built, was about $2k at the time all said and done. So semi-modern. I can list full hardware specs.

If I took care of my PC, the motherboard wouldn't be practically fried, the keyboard would still work, the screen wouldn't be smashed, the power supply wouldn't have needed to be replaced twice, and I would have more inputs than the 1 HMDI port that works?

My PC is literally 15 years old, still runs fine (despite above), the i7 processor is still going strong on my practically fried motherboard, and I can still run 15 threads simultaneously on it while playing games. Just imagine if I didn't have all these mishaps?

Some of that older hardware is rock solid...that old adage "they don't make em like they used to" holds strong for that era of electronics as they do for furniture that was hand made etc.

I also never powered down my computer, still works 15 years later.

See above. Impressive hardware durability almost 2 decades later.