Yes, brandy is a good carrier for certain herbs. And it's pretty good with honey when you have the flu!
I got a surprise years ago researching alcohol uses. (PubMed data base is a wealth of info)
Anyway, alcohol is used to make dozens of processed food items at a market. For instance, it's used to make ice cream. Yes indeed! It's a solvent... say folks at Breyers make a giant container of strawberry ice cream.
They make the ice cream then add strawberry syrup. then add a bit of alcohol, a solvent. The alcohol dissolves, helps disperse the strawberry flavor into every bite you take.
Same process in tinctures.