When I repair or adjust the machinery properly and the machines are "fed" the appropriate stuff, it works reliably, very reliably.
In industrial processes, there are no happy accidents.
Photography, the craft, is an industrial process. A given input, using a given process, and given materials, produces a given result. If we pre visualize and execute the tasks involved properly we get a given result.
Surely, in photography, we have all had happy mistakes, but in my experience they are normally the exception, not the rule.