I would absolutely love to see glass blowing. I want fancy bottles for my wines and brandy. It does sound like more work on herbalism/brewing is at least planned, hopefully including more aging mechanics for existing spirits, and ways to brew some completely new substances, both practical and less so. All of that would be greatly complimented with glass as a requirement at higher tiers. Sulfuric acid is, indeed, a fantastic example. There are things you only ever want to store in ceramics, things you only ever want to store in glass, and things you only ever want to store in metal, and it'd be great to have all of these as options. Even if it's just aesthetics, honestly.
And yeah, I think it needs to be one of these systems that is pretty delicate and way easier to mess up. Something where messing up a voxel means you have to start over, or having to make sure you move the glass to an annealing kiln before it cools too much, or it'll just shatter. That would neatly follow the established progression. Mistakes in clay can be fixed easily at no cost. Mistakes in smithing cost you durability or even an ingot. Mistakes in glass would mean starting over.
