Effectiveness over process
When you’re spending lots of time on getting your system in order, chances are that from time the way you’re working is holding you back. Example: blocking a weekly no-meeting-day can be really good for your productivity, but it could also mean you’re missing on a deadline or could have made big progress if you didn’t decline a 15 minute meeting.
Instead, always focus on what’s most effective: processes should help you to be at your best. If there is another way, don’t be afraid to break the rules.