> We all know that BigBrand gets it from the same supplier
We don't know that. Look at Project Farm's review videos, he tests a lot of knock off and brand name products and it's almost always a get what you pay for situation. Knockoffs look similar, but use cheaper materials almost always.
The question is almost always, do you need the quality that you get from name brand. Not "why can I get name brand quality of half price"
Are we talking knockoffs like actively pretending to be the brand, or knockoffs like an off-brand copy of the exact same product? It's rare to find quality that can only be found with one brand—and then, it's mostly extremely expensive consumer electronics.
I love that guy's reviews for the thought and detail he puts in them. But his voice is like nails on a chalkboard. I'm looking forward to AI letting me swap it with James Earl Jones.
He also routinely tests three or four identical products with nothing distinguishing beyond different paint jobs.