For one example, a manager who has regular 1:1s with their reports probably won't be blindsided when they quit or miss a deadline.
For reports who need a bit of a support in raising issues, this is an effective way to make that space. People new to lecturing are often taught to count out 30 seconds after asking questions, for a good reason: silence is awkward, and questions are the salve that even shy students will reluctantly reach for.
Also, there is stuff that needs to be discussed that shouldn’t be in an email or be discussed out in the open. You know, things meetings are actually good for.
Maybe I'm reading this wrong, but it sounds unhealthy to have that much of that kind of stuff that you'd need to discuss it with no record of it on a regular basis.
But the manager isn't the person who can easily make that judgement call. IMO, the correct person to judge that is the direct -- they can't just show up at their managers desk and demand a 30 minute meeting when something important shows up, whereas a manager can (and often does!)
Generally ideas like this seem to spread because it was part of some successful company and so it got written up and now a lot of people copy it because it's easy to copy and they think it will help make their own company successful.
As a result, the thing that actually occurs in a lot of places is a manager reading from a script that they've been trained on a little bit from someone else.
It does not feel useful to me.
Also, I think all managers should be asking what cadence and length of time their directs want for 1:1.
The least would be 30 minutes bi-weekly IMO.
The most would be 1 hour weekly.
Depends on the person, the projects, where they are in their career, etc.
I have 20 years of experience in this field, and a vital part of the job is communicating well with other people. I do not need someone's "Management Best Practices Checklist" in order to do that. And I do not think I'm exceptional: most of us got by just fine without all this.