I did some reading, and apparently there was a definition change in 1996, on what was legally considered a permanent foundation, and this home was from 1994; so that explains the tie downs...
The water heater, it's more of a rant; but; insurance, requiring replacement of roofs, water heaters, ect... Water heater that works, no reason to replace at 25 years; roof, if in good condition, replacing on a time table, again, stupid. Roof, ok, that's a structural component, so, to some degree, I guess. A water heater; if it fails, why would insurance care? They aren't covering mechanical break downs... Be like your car insurance requiring you to replace your transmission at 10 years, just because.... At what point does insurance want you to just do PM service of replacing your AC, doors, refrigerator...