Just a few observations and thoughts.
Recently I was looking at key boards and the two most popular big name brands were Logitech and Microsoft, along with several no-name brands that were much cheaper.
One thing that I noticed is that the Logitech and Microsoft models had keys that felt nice to the touch and would be a pleasure to use on a daily basis.
The no name brand models had lousy tactile feedback of the keys and their plastic chassis just felt cheaper = thinner and less substantial. They flexed when twisted. The battery compartments on the keyboards and mice were more difficult to access and it was clear to see that thinner materials were being used. On those still tethered with cables, the cables were thin and short. Generally, they looked like they were built to a price.
So, although a few factories might manufacture several re-badged products on their flexible production lines, there is always the possibility that the big name brands may specify certain (approved) components and materials as well as certain assembly, testing and packaging requirements, which differentiate their re-badged products from the non name brands?
So, there may well be a case, for critical items, that you do indeed get what you pay for?
Cheers
Dennis