Trying out this informative trike forum. Last time I rode a (two-wheel) bike was during the Navy days - decades ago. Wife with BAD wrist (as in - can't work a clutch lever), likes the comfort/passenger safety of a trike for road trips (yeah "safety" is a relative, but not entirely undesirable thing), also likes the tow-ability of a ~1,200 pound trike.
The Internet is full of jabs like "trikes are uncool big mobility scooters for old guys (and gals)." These jabs do NOT get under/through our thick skin however.
Knowing your limits is always good . At this point in our lives, picking up (solo) a dropped ~900 pound dressed-out cruiser - isn't exactly our idea of fun... Aware bikers understand that many older riders have disabilities and health issues, particularly in the later years. These issues preclude safe, two-wheel operation - so pragmatically - a trike, while NOT a two wheeler, makes a lot of sense.
And today's trikes run the gamut from V-8 auto Boss Hoss', to Gold Wings, to TriGlides, to Indians, and also a bunch of one-off customs.
So just like all branches of the US military have their role, on the USA's DoD Team, trikes of all types have their place in any garage or club.
So hopefully, aware two-wheel bikers will share a brotherly three-finger wave to trikes, as trike riders share two finger waves with them... keeping two/three wheels down is a good thing.