This is always naturally in contention because if you don't also constrain scope of work an employee can work in competition with their day job "on their own time" based on information they wouldn't have if they weren't employed by the company.
So this isn't supposed to cover random side projects, but should cover you creating a competitor, or related patents, etc. "off hours". Some companies legal departments just try and claim everything because it's easier.
The way I've seen this done well is some sort of internal review and/or disclosure mechanism.