I'd love to do that. But once you throw in real meetings, no meetings days, PTOs, time zones it becomes difficult to schedule a work meeting because now there's no overlapping block of time when you need to meet. Now all meetings get pushed out even more and the calendar time required for certain tasks increases.
I switched teams a year ago and quickly blocked off 2-3 hour slots every day as "focused work time". It's been a godsend for my sanity.
Edit: typo
Lately for a 1-3 day horizon I've been adding everything I'm working on as blocked. That definitely helps me visualize my priorities for the next couple days and whether I have room to fit more meetings or tasks. The main downside is I'm used to a more free-flowing schedule where I pick a task based on how I'm feeling.
* I work with too many people to reasonably instruct them of this preference and expect them to follow it.
* The definition of urgent is highly subjective. What's urgent to one person isn't to someone else.
* Some will be more aggressive and book over it, while others will be more passive/shy like junior engineers. You're now further rewarding aggressive behavior over passive behavior.
But more importantly non-urgent meetings are still important. If everyone does this then the minimum turn around time for engineering tasks needing help/consensus between 3 engineers goes up from a few hours to a few days. You compensate this by juggling more tasks.
I think in practice the downstream problems are much worse than the original problem you're solving. I prefer to just decline any meetings that aren't a good use of my time.