>how concerned should I be about all my functionality existing without JS?
If something seems worth using and it requires JS to function correctly, I'll go ahead and enable JS. Unless you have projects in mind along the likes of jsFiddle, I don't think you have much to worry about.
As for why: it's nice to keep my laptop quiet and power-efficient when I'm simply browsing (especially if I'm not plugged in), a task that shouldn't be resource-intensive; it's an easy way for me to prevent potential malware when I'm using Windows.
Comments
>how concerned should I be about all my functionality existing without JS?
If something seems worth using and it requires JS to function correctly, I'll go ahead and enable JS. Unless you have projects in mind along the likes of jsFiddle, I don't think you have much to worry about.
As for why: it's nice to keep my laptop quiet and power-efficient when I'm simply browsing (especially if I'm not plugged in), a task that shouldn't be resource-intensive; it's an easy way for me to prevent potential malware when I'm using Windows.