Do any bars or restaurants use small stemware any more? I’m talking about tiny wine glasses that hold a serving of sherry or port, or, for that matter, a pousse cafe. I can only recall ever seeing a shot glass in a bar or restaurant. I would imagine their fragility would pose a problem.
I use these small wine glasses frequently at home, and back in the 19th century, they evidently served as measurement tools, like jiggers, although I have trouble imagining they were ever all that standardized in volume.