I think there is one big difference: In many areas (I'd venture to say "most"), an engineer is required to be involved in the design of a commercial space, and is not required to be involved in the design of a residential space. It does kind of make sense to have some design mandates for residential, to directly protect people from using extension cords.
How many times do you have the fire marshal over for tea, you know? In a public space, if there's a safety concern, there's a bunch more eyes on it.
Just spitballing here...
Agreed, and would like to add that a home is very likely to have quite a few owners and most of the time when a home is sold the home is not remodeled nearly as extensively as a commercial space would be to suit the new owners needs.