What actually makes a good coffee lover gift for your friend?
Usefulness should not mean impersonal. Good options include better beans, brewing accessories, accurate tools, storage and small upgrades that improve a routine they already enjoy, but the exact choice should reflect shared references, recurring interests and the things you know they enjoy outside the friendship itself. A common mistake is another mug unless the mug itself is unusually well chosen. Another is overly personal items unless you know their taste very well. Choose the version that matches their actual level, setup and habits rather than the most broadly marketable version.
The strongest gift ideas usually come from the person’s real habits: what they already use, what they talk about and what would make an existing interest better.