"Whois" is already basically worthless
... to anyone but a lawyer, anyway, given the nonexistent quality control/fact checking of the data.
If you actually want to know who a domain belongs to - then you're dependent on whoever registered it having acted in good faith and entered truthful information. Often, they do. But sometimes, particularly when they have something nefarious in mind - they don't. They'll enter the data of a personal or political or business enemy, or a nonexistent person.
And there's pretty much nothing to prevent this, apart from the minimal amount of effort it takes to do.
If you're an IP lawyer, who wants to cover your arse by writing to a domain owner asking for permission to rip off their content - then that doesn't matter. You can write, and when they don't respond within a reasonable time, you can say you've done your due diligence. It's meaningless, but you've done it. Go you.
But if you're absolutely anyone else, just trying to find out who owns domain.com - it's useless.