The times i've ever actually needed 'runtime' polymorphism (usually implemented w/ subtype & virtual methods) are utterly dwarfed by the times I'd been able to

The times i've ever actually needed 'runtime' polymorphism (usually implemented w/ subtype & virtual methods) are utterly dwarfed by the times I'd been able to make use of parametric polymorphism, which I find far easier to reason about and use.