Most tradies I talk to don't describe a systems problem. They describe their evenings.
Quotes at 9pm. Callbacks from the ute. Tomorrow's schedule texted from the driveway. Invoices on a Sunday with Xero open on the couch. None of it is hard work. It just can't happen while you're holding a drill, so it gets pushed into the only hours left over.
That holds up until the business gets busy. A big week on site means a big week of nights at the table, and a sick day means everything slides. It's running on memory, and memory doesn't scale. The business can only grow as far as one person's evenings stretch.
I saw the same shape in our own gym. The coaches were on the floor all day, so the enquiries waited for whoever had energy left at the end of it. What changed things was moving that routine work into the day, where a system handles it while the people do the job.
We judge the system by how much of your evening it gives back.