Agreed. My wife would not be able to single-hand a 43 ft. sailboat (in presumably difficult weather) but I know she can drive the boat on engine power. If you go overboard *and* have an engine failure, now we're talking multiple concurrent "failures" and the combinations become much, much more complex. Not that you shouldn't consider them but it becomes almost overwhelming to a "non-sailor". Keep it simple to cover the most likely scenarios.