It seems like you're asking about the disadvantages of using a "Brandt line." However, there isn't a universally recognized term or concept called "Brandt line." It's possible you might be referring to something else.

Could you please clarify what you mean by "Brandt line"?

For instance, are you referring to:

* A specific product line from a company called Brandt? If so, please provide more information about the company or the product line you're interested in.

* A specific branding strategy or technique? Perhaps you're thinking of a marketing term related to brand strategy.

* A technical term in a specific industry? It's possible "Brandt line" has a specific meaning in a particular field.

Once you provide more context, I can help you understand the disadvantages you're looking for.