I don't have any first-hand knowledge here, but my guess would be that the corporate lawyer's recommendation is always going to be "just get consent for every cookie". The alternative is to risk lengthy litigation over whether specific cookies required the consent. If they ask every time, they can avoid that nightmare.
Because of this, the notice doesn't really serve any purpose of a signal of sysop goodwill. Virtually every business large enough to have lawyers will add it where there's the possibility it'd be required, regardless of the cookie's intention.
Well-intended law that causes many negative side effects is still bad law, just as well-intended software may very well still be bad software.