May I suggest that part of the problem with changing from one flying machine to another is caused by the training industry making things "seem" more difficult.
A good case in point with flying is after teaching someone to fly an airplane and giving them the license to allow them to fly by themselves by adding one or two simple to operate levers, switches, knobs or whatever, the machine suddenly becomes "Complex "
That does not make any sense in my opinion and only adds doubt in the mind of the person wishing to change into another airplane.
However adding another engine and putting both out on the wings does require more slill to fly safely, if one quits that is...
Chuck E.