writes:

Care to quote the law or regulation that says you must be "on instruments"
whenever you are in IMC?

This is a bit like asking for a law that prohibits you from grabbing live
wires and electrocuting yourself. Why do you exhibit this adversarial
attitude towards instrument flight?

You can often depart SVFR in poor weather, but just because you aren't
absolutely required to be IFR doesn't mean that SVFR is a smart idea. If you
want to fly in marginal weather conditions, get an instrument rating instead
of gambling on technicalities; you'll live longer.