No of course not. This is not only incredibly pointless with modern browsers and how almost all URLs work (like seriously, why would anyone bother to take the time to type out
www.uselectionatlas.org to reach this site?), it's actually a really awful habit since non-tech people will often type in "www." before every URL they're given even if not stated, and if it has a subdomain before the main domain (such as accounts.google.com) it won't work if the www. is added before. And as anyone who's worked a tech support job that involves directing people to subdomained websites can tell you, this is not just a small minority of really technically incompetent people who do this, but actually most people who are over the age of 40 and not tech geeks.
I heard about this once for a company that did a test before job interviews. The applicant was given a sheet with a list of instructions to follow on the company's web site. The first step listed was "Type in companyname.com on the browser's URL bar". If the applicant typed in "
www.companyname.com" instead of "companyname.com" the interview ended there and they were not hired.
I actually think it's probably been a decade since I've typed in "www." before a website name...(the exception being one of my credit card's sites that's the rare website that requires the www, and thus it throws me off and I enter it incorrectly at first half the time.)