Universal or varietal?

One glass can be a practical choice. Glasvin describes its Universal as suitable for every kind of wine. RIEDEL describes wine-friendly glasses as designed for wine generally, without targeting a particular grape.

Neither source establishes a quantified loss for choosing one shape. We do not invent one. The finder considers one wine at a time so its recommendation can be traced to a maker’s documented guidance, not because you must buy a different glass for every bottle.