were there any "not exactly street legal" bikes at that last dual sport ride you went to?
Yep, the majority were "not exactly street legal".
I've been riding in 5 to 8 sanctioned dual sports per year since 1995, and the last time one of my bikes had turn signals was 1999. Although, all of my bikes have had legitimate street plates.
Everyone seems to think that dual sporting means 50/50 tires, turn signals, and DRZ and XRLs. THIS IS FAR FROM THE CASE. Most dual sport rides I do are more like enduros without checks.
Heck, each day at the Hancock Dual Sport had more trail than the Barbwire Enduro and some might say that Hancock is more challenging.