Its not the brand discussion that is an issue at all, it is just the courtesy of naming the substance as well because substance brand names vary by area.
The other thing is there is no brand comparison allowed. So you can't discuss what brand you think is stronger.
But if you have a question about a specific brand like the formulation that should be ok.
It shouldn't be a problem discussing the fact brands are different to some degree if you don't mention the brand.
From what I have read at least in the States brands can vary up to 20%+/- from the original brand name.
That is pretty rare for more popular narcotics but it does happen. I never noticed much of a difference between brands of oxycodone but yeah I suppose I did prefer one brand over the other a lil bit.
When it came to formulations that affected me. The "tamper resistant" formulations hurt my stomach and later after I started abusing drugs I preferred the brands that were less dangerous to break down for iv use because they were less deadly, easier to break down, and some product was lost in the process.
I do think what the original post is referring to is a placebo effect. I never noticed a difference between oxycodone brands, benzos yeah.
You can always ask your doctor for another brand and it may go over well or might get you dropped as a patient. I have had both happen.