Ahh yes, so the future generations of archaeologists have a Pompeii to uncover
Found in a time capsule in 2150: hey guys, we left you a little something over there by Vesuvius...you'll thank us later. And you better not have built a McDonald's on it...
Its arrogant to think all the information we have now will survive long term. Future humans may curse us for the all history we've destroyed while studying history.
Our records of the state of pompei are stored in computers and books, which will decay a lot faster than buried stone. In 300 years, people might get bored of Pompeii and the records could be left in disrepair, or maybe contemporary retellings of the history will have picked up a lot of falsehoods due to natural drift. And this is to say nothing of the possibility of society collapsing due to climate change.
If Pompeii is buried, then in 1000 years archeologists can go check for themselves if the information they have is accurate. Just like we did.
Do you think there is 1 copy of a book on Pompeii and a single hard drive? Your idea makes sense to my high cousin. So are you just high fam?
https://www.newyorker.com/magazine/2021/11/29/pompeii-still-has-buried-secrets
About a third of the ancient city has yet to be excavated, however; the consensus among scholars is that this remainder should be left for future archeologists, and their presumably more sophisticated technologies.
Scholarly consensus is that part of the city should stay buried. There are all sorts of concerns about visitors damaging Pompeii. That article is full of them. During World War Two, a group of allied soldiers thought Pompeii was a nazi encampment and shot at it. Nobody wants Pompeii to fall into further ruin.
Hard drives don't last 20 years, and even then, there can be an unforeseen event that can render those drives inoperable. Preserving the original site would just be another form of redundancy.