The aesthetic changes continually, as you would expect for something 40 years old. But my point is it was never "medieval", and the original aesthetic certainly wasn't.
What I'd say is, it was part of the completely BS pop-history hodgepodge that people mistakenly think is "Medieval".
It has ladies in 12th century fashion living in 9th century castles swooning over 16th century plate-armored knights while lords practicing 17th century political philosophy fight wars using 7th century military tactics to fight over resources that wouldn't be known to be actually valuable until the 19th century (like platinum) using communications and travel ability that rivals 20th century infrastructure.
It's
literally not possible to pin the entire thing down to a singular period of human history because it is actively taste-testing just about every century that came after
the fall of Rome (which, whatever your beliefs about it, "Rome" as a Europe-spanning empire was gone by the 6th century.) But this hodgepodge, as ridiculous as it is, is what a lot of people
think when they imagine "Medieval Europe": something that somehow combines the Wars of the Roses, plate armor, rapiers, Charlemagne, courtly love, and knights errant all into one big blob, no matter how hilariously
wrong that is in terms of the actual history of Europe.
But what this means is, D&D has always been a
highly selective take on what is "medieval" and what isn't. Every edition has chosen that take differently in one way or another. To claim a betrayal of that spirit
only now, when the seed was planted literally before D&D was even a twinkle in Arneson-and-Gygax's eyes, is either disingenuous, or a demonstration of self-deception.