From an OSM perspective the 'brand' might not be required, I couldn't say for sure. The Wiki reads "brand:wikidata=* should be accompanied by the corresponding human-readable brand=* tag." but then follows with "while this is redundant from a data perspective ..".

I'm only coming from an NSI perspective, and without the 'brand' to go along with 'brand:wikidata' many of your edits may flag with the standard "this entry looks like a brand" and I believe there might be tools out there which pick up on these, which could (rightly or wrongly) create more warning reports.