Abilitys which proc on hit effects, doesn't give stacks for Guinsoos Rageblade

I tried this with Warwick. His ult doesn't give stacks, so you have to make 4 Autoattacks afterwards to get Guinsoos Rage. That is non-transparent design. Warwicks ult procs on hit effects. Autoattacks give a stack for Guinsoos Rage. So there has to be a special rule here, but you can't read this rule anywhere. Please make the game more clear with less exception rules, or at least mention them.
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