Old-school AV works by running scans and comparing your files against a database of known viruses to identify them. It used to work, but not anymore.
It's not as scary as everyone thinks. AI in antivirus allows your protection to have real-time access to your applications, getting rid of the traditional scanning and fixing process.
People creating hacks and malicious software are keeping up with the latest developments in technology. The only way to keep up, is to adopt the same approach and to stay one step ahead.