hong said:
... and by extension, read a number from it, which is what I was saying, yes?
Not really. You were using the not-common-English gamer-vernacular version of "roll" which means: determine a number from a possible array with varying degrees of statistical likelihood (or something to that effect). I'll grant that "getting a reading" is implied by "roll the dice", but by no means is that result necessarily numerical. Some games use non-numerical dice, and in the common vernacular we still call that "rolling the dice." Furthermore, if I were to tell you to pick a number between three and twelve, we wouldn't say that you "rolled" it (unless we'd all been playing too much WoW - in which case a strong case could be made for the argument that none of us would be speaking the common vernacular anymore.)
In plain English, "rolling dice" necessarily implies physically picking them up and tossing them, which you do not do when you score a critical hit. Sometimes we use the phrase "rolling the dice" as a metaphor for "taking a chance", but since this is a metaphor it is an exception and wouldn't rightly be thought of as the "common vernacular" meaning of the term - furthermore, that metaphor doesn't necessarily have anything to do with numbers.
/end grammar discussion.
(Really, the "common vernacular" meaning of the term is irrelevant, since within D&D's own definition of the term a "roll" does not take place with a critical hit - see below.)
hong said:
Sure it would, because you treat a crit just like any other die roll. You just get max damage automatically.
Well, no you don't treat a crit like any other die roll, because it isn't one;
you don't roll the dice for a crit. You just mathematically work out what the maximum result of a roll
would be, and then you
don't roll the dice.
Quoting the PHB, emphasis added:
"
Rather than roll damage, determine the maximum result you
can roll with your attack. This is your critical damage."
Please carefully note that saying you "can" roll damage with an attack does not mean that any roll actually took place for a critical hit. The critical hit rules explicitly state that you
do not roll damage.