There’s another, more DNS-related, reason why it was usually preferred to have something before the domain part. It’s possible to alias a subdomain to another subdomain, but not so with the root of a domain, which must point directly at a single IP address.
If your IP addresses are more subject to change than your hostnames, or your site was hosted on a third party service, then it made sense to point www at a particular hostname rather than its address. e.g. you might point www.your-domain-here.biz at a-hostname.the-hosting-provider.tld. That’s not possible with a root domain. IP address or nothing.
Similarly, it’s possible to point a subdomain at multiple IP addresses (or multiple hostnames) at the same time, which was a cheap way to do load balancing. i.e. For a site a user hadn’t visited before, they’d be basically told one of the listed IP addresses at random, and then their local DNS cache would return that one IP address until it expired, generally giving enough time for the visitor to do what they wanted. Slap 8 different IPs in the www subdomain and you’d split your visitors across 8 different servers.
Root domain has no such capability.
Technically it would be possible to do all of that one level higher in DNS where your domain itself is the subdomain, but good luck getting a domain registry to do that for you.
I haven’t done DNS in over a decade at this point, so things may have changed in the intervening years, but this was all definitely a thing once upon a time.
Find a way to call the authorities. I don’t trust my brain at the best of times, and for all I know, I’m the murderer despite no recollection. Because of no recollection. That’d be a sign of some kind of mental problem, right? And if I’m otherwise fine and not responsible, there’s still a whacking great gap in my memory (for how I came to be there) and there’s a murderer on the loose.
I’d also try not to contaminate the scene any more than I had to.
Knowing my luck, the police would pin it on me anyway, but since, as I said, I don’t trust my brain, as far as I know, they might well be right and it might be the best thing for everyone if I am put away somewhere.