If absolute power corrupts absolutely, what does absolute weakness do?

I'm a common item in your house, or even a sports bar, Sit down and watch me for hours, your attention won't go far, Too much of me is bad for your eyes, parents have concurred, I'm not the abbreviation, but the full word

Long before I became synonymous with an elf, I was a supporter of seasonings and recipes on index cards

You can swing from me but you mum won't like that!

Not maple or oak But of the same kind When you think of me Keep Christmas in mind My wood is real soft My needles are fine Don’t call me a spruce Cuz my name is