[mothered]

I have a query related to JS. Why it is still being used by many websites, email services , chat services , etc  in spite of having so many vulnerabilities that could cause harm?
And what can one do to prevent if using JS is the only option to access?

JavaScript Is supported by all major browsers and works hand In hand (as needed) with websites. To name a few uses, animated webpages, webpage Interactivity, search boxes, registration/sign-up forms and a lot more.

It's also responsible for an array of Information gathering, such as browser type & version, operating system used, hardware specifications, location, login types, connection type (ISP, Internal/external IP addresses) and the list goes on. Only use JavaScript as needed and make sure It's utilized on reputable services. If unsure, use a VM during your navigation online.