I have nothing intelligent to add here, just an anecdote. In several books I saw the admonishment "ONLY use metal lamps, never glass" for years. Only recently I saw the edict explained and it made perfect sense.

You don't use a glass lamp because if it hits the floor, it is nothing but a Molotov cocktail.

And then the lightbulb went on as to why the lamp must always be metal for purposes of stock fitting.