It's just hard to understand that no proper sequel, bringing all the longevity / replayability, the flexibility and the immersion was created in the 20-25 years since those games came out.
So people cling to the possible explanation that, maybe younger generations of designers just don't have it in them to create such games - but what if the original designers returned, those same people that designed the original, now idolized games?
Sadly, those people are now old, and no one should begrudge them for wanting to take the easier way. They grinded away years of their lives, sleeping in the office, hardly ever seeing their families or any other people besides their co-workers, thriving on fastfood and ramen, and they delivered those classic, unsurpassed games.
But now they are aging, married with kids, maybe even grandkids, and when they take a look at the long climb on a steep flight of stairs that would be required to bring forth another classic game, they take a sigh, park their behind on the stair lift and deliver yet another mediocre game, like all their young contemporaries do.