If a better Latex only saves you 5 minutes per year, then that means, that you are either a latex god, who types 200wpm in special characters and talks latex fluently, or, that you don't actually write much documentation per year, or, that someone else has invested significant time to create all the document layout, macros, environments, etc. so that you only need to type the text.

My point is, that creating a proper latex document, specific to one's use case can consume many hours of time.