BiggusGeekus said:
We don't have firearms because the universe/gods don't let us or the materials aren't there. OK.
I think guns are possible, but not used because of the monetary investment and because folks that have power don't want them advanced. Moreso because we want armor, and guns make armor worthless.
But ....
We have dwarves who can make an adamantite sword cut through volcanoes but they can't muster up the metallurgy to make a decent steam engine railroad.
Seriously, how many folks hate Eberron for the magic railroad? I do think dwarves/ gnomes have steam engines for some uses though, just nothing world spanning.
We can build roads, but not dig a trench for canals.
I'm pretty sure we have canals...
We have gods of healing and knowledge, but they never get together to work on germ theory.
We have a heal skill that aids disease recovery, so I assume a basic knowledge of disease and poison. Magic does hinder a true working knowledge, and we haven't actually mastered disease in real life either... of course, it's rare for a real "massive plague" in D&D.
That said, my pet peeve (which Eberron somewhat addresses) is that magical healing seems so inaccessible to normal folks. If the village priest wouldn't cast CLW to save little Timmy from bleeding out, then he'd be the next one bleeding out.
We have the ability to cut 10,000gp crystals and minerals, but we don't have the optics to make a decent magnifying glass to look at cells.
I'm sure they do have optics, and I'm sure some have a working knowledge of basic components of life. It just doesn't come up, and I doubt commoners care.
It is more important to a city to magic up a +2 longsword than it is to feed thousands of people. This applies even to lawful good areas.
Yes, the kings crown costs enough to feed thousands, and Defense budgets are high. I can't help you there.
People worship evil gods and commit evil deeds knowing that there exists a literal hell. Anywhere that has so much as a 1st level cleric can get daily confirmation of this. The level of communication between deity and worshiper could only be improved with instant text messaging, yet almost every lawful good church in D&D has at least one person, if not a sub-organization, that operates with malignant motivations.
Evil lies, and the fact you can become a Balor eventually is a great lure. At the same time, Evil never tells you how long that might take...