What we have here is a difference in semantics. An inside guard rail against which the back of the flange of the wheel contacts is "bearing" the friction of the flange, and its purpose, as you said, is to keep the flange of the wheel on the outside of the curve from contacting heavily and possibly climbing over the outside rail due to centrifugal forces. I have seen the gauge side of the outside rail on sharp curves worn back nearly to the web of the rail by such pressure.
As for an outside guard rail to support the wide tire on a bald driver, I have seen such guard rails installed on enginehouse trackage traversed by 2-10-0 locomotive with second, third and fourth drivers blind, with 6-inch wide tires. I've also seen this configuration on sharp reverse curves on industrial trackage switched by 0-6-0 and 2-8-0 engines with blind drivers.