

Yes, a lot safer. Even bugs in the renderer or media player would typically be triggered by JavaScript by say, moving elements around really fast or whatever.
Without JavaScript, the browser renders that page and that’s it, there’s no JS to modify it or open popups, nothing to dynamically load/refresh content. The most you can do without JS is animations and responding to simple events like changing the color of a button when the mouse is over it. So your only shot to attack this is the renderer during initial page load, once.
It’s not the size, it’s a size to content/quality ratio. I’ll happily download a 500GB game if it’s got the content to match.
Uncompressed assets doesn’t bring higher quality visuals or content, it’s merely pure laziness or a scam to make people feel like they’re getting more for the outrageous price games have gotten.