Size of silverware/flatware (esp. spoons)

I’m pretty sure that the amount of liquid contained in a standard teaspoon or tablespoon is not necessarily the same as the exact measure of “teaspoon” or “tablespoon” that you might find in a recipe. But do the manufacturers pay attention at all and attempt to make it reasonably close? Or do they possibly ignore the volume altogether?

If the former, then I would imagine that forks and knives, which are not made to contain a volume of liquid, have a greater variability than spoons.

[A couple of years ago, my wife and I ordered some new silverware based on pictures online, and were startled to see that the stuff was massive as compared to what we currently had. On then paying closer attention to this matter and looking at other sets, it appeared that the style had shifted in favor of larger silverware generally. But the weird thing is that the change is not just one of appearance/style, but would impact how much food a user ate at a time, especially in the case of spoons. So I was wondering if perhaps all wider spoons are somewhat shallower and vise versa, or something along those lines.]