Good morning,
For me the Trike serves a couple purposes.
I'm 38 years old, and my health is not a concern. For me, I love the styling of the Spyder. I think its cool looking, and fortuntely, being the guy paying the note, I love riding it.
It gives my wife peace of mind knowing its loaded with safety features, and its a big, heavy, highly visable road touring bike. It's stable, comfortable, and the learning curve for her was greatly reduced.
I respect all riders, and I can appreciate your badge loyalty. If someone wants to ride a 2-wheeler, far be it for me to be judgemental.
I will admit I struggle with the whole "Why" discussion, especially since it doesnt impact anyone but me and my wife what kind of bike we ride (and it is a bike, just for clarification).
Enjoy your time, enjoy your ride, and if you decide to wave at me coming the other way, great! If not, you're going the other way anyway,...later.