It isn't just about technology, though. The old medieval social structure went away, along with nearly all of the traditional D&D character classes. Fighters and monks might still be around, but barbarians, paladins and rangers would be relics of the past. The Red Death's corruption of magic made it very dangerous to use at this point, so all magic-using classes (arcane or divine) would be extremely rare/non-existent. In their place came the more generic classes of D20 Modern.
And yet... there're still 21st century ideals in PoTM. Bring back slavery, bring back rasist barovians, bring back bigots who lynch same sex partners.
Eer mah Gerd Immersion broke long ago.
*Edit.
Okay. I'll be productive.
I'm not sure if you're trying to be sarcastic or not. But never the less. Ravenloft is a Fantasy setting. the bigotry and discrimination that takes place in the setting reflects the Gothic Horror setting and serves a purpose for making that Gothic Horror Element.
Hazlan already has slavery, represented by the subjugation of the Rashemi. Barovia is already extremely xenophobic and skeptical of magic. Port-a-Lucine has class struggles and marriage/love influenced by the political and social conventions.
The important distinction with bigotry and discrimination in fantasy settings is that
it does not replicate/repeat patterns/behaviours/codes/signals of real life hate speech and discrimination. That's the important line that keeps fantasy social baggage fantasy and character/story focused.
Furthermore, Gothic Horror is kind of like. The best genre for exploring social issues. There's lots of papers already about how monsters in Victorian and Restoration writings emulate queer struggle. Not to mention how Gothic Horror tends to dress up different social issues in the lens of monsters and spooks as creative ways of exploring these issues without actually approaching the difficult subjects in direct case studies.
The whole 'muh immersion' broke is, idk. We're replicating literature genres and stories. Fantasy. Not real-life politics. Making these RL issues replicated IC as some kind of setting flavour would just be bringing modern social politics into a fantasy setting. Which would be more immersion breaking and pretty uncomfy for a lot of people.