You were one who though that flying, fire-breathing T-Rexes bringing down a modern society armed with missiles, tanks and supersonic aircraft was somehow more realistic. To me that seems way more absurd outcome than that a crack team of super-skilled renaissance badasses having a fighting chance against that giant lizard.
I don't think that's an accurate characterization. He was pointing out that humans fighting dragons with rockets is a much better simulation of how real people would need to fight such a creature than doing it with swords, lances, or arrows. And yeah, that's pretty inarguable.
But in a world with fireball and holy smite, aren't they equivalent?
Not really? Lances, arrows and swords aren't fireballs.
Sure, fighting magic with magic makes sense, but then we're outside the bounds of simulation, as
@AbdulAlhazred and
@Manbearcat have pointed out. There's no longer any common reference point in reality for us to refer to and say we're simulating.
I personally DO like to try to simulate SOME parts of reality. Again, I've often played in games where, presented with a load of treasure weighing X, or a dragon corpse weighing Y, that needs to be extricated from some place and transported back to town, we plan out those logistics with reference to real world measures and objects and wagon capacities and so forth. And that can be a fun game (assuming people in the group don't find it tiresome and boring), and feel grounded. And my impression is/was that this is the same kind of thing you're talking about.
But the other guys do have a point that some stuff in D&D just defies attempts to connect it to reality, and on that stuff, we have to acknowledge that we're no longer simulating reality, we're doing genre emulation, I guess.
The tricky bit, I think, is to kind of consciously figure out where our boundary lines are, and make sure we're on the same page with our group about them. Because if the DM's ideas conflict with the players' about what's realistic and what we're glossing over or writing off as magical, we get clashing expectations and loss of fun.