Google won't let you sign in if you disabled JavaScript in your browser
Found on ZD Net on Thursday, 01 November 2018
The reason is that Google uses JavaScript to run risk assessment checks on the users accessing the login page, and if JavaScript is disabled, this allows crooks to pass through those checks undetected.
Further, Google also launched reCAPTCHA v3 this week, a new version of its reCAPTCHA technology, which uses JavaScript to compile "risk scores" on a per-user basis. If JavaScript is turned off, this effectively negates reCAPTCHA's capabilities, hence, the reason to prevent users who intentionally disable JavaScript in their browser.
It's well known that turning off Javascript has often very positive effects such as less tracking, faster loading times and less annoying ads. Some websites break with JS off, but that usually means they webmasters aren't worth a cent; and websites which want to force you to use JS, well, sure they can try, but it's easier to just move on to another site.