A retailer's content problem is harder than a brand's
You are selling other people's products, which means the obvious subject matter is not yours.
A brand can post about how its product is made, why it exists and what it does. A retailer stocking many brands has no equivalent, and defaults to product photographs with prices.
That is a catalog. It gives nobody a reason to follow, and it competes directly with the brands' own accounts, which have better material about their own products.
What a retailer has instead is perspective across the category. What is worth buying, how things compare, what is actually different between two options, what is new and whether it matters.
Curation is the underlying value. If the range was chosen for a reason, saying what that reason is turns a catalog into a point of view.
The buying guidance a retailer can give is genuinely useful and no individual brand can offer it, because no brand is going to explain when its competitor is the better choice.