The soil itself also contains information. Not disturbing that unless necessary will let future archaeologists with better technology extract more information.
Also, I'm guessing that the sand encasing the site is a temperature/climate controlled structure when buried properly. No sunlight and no air, for starters.
That's a valid argument against ever performing any dig whatsoever, since it's always true that future archeologists might have better technology to extract more information from anything you find.
Exactly right. This is a question that archaeologists are always supposed to ask before digging. If there's a justification for having the answer now (like an immediate research need or a threat to the site), then excavation may proceed. Even then, you excavate as little as you need as nondestructively as possible. Usually that'll be a single trench/pit you excavate with hand tools and re-cover when you're finished.
Most regions have databases full of known sites that are unexcavated because there's never been a justification for digging.
I suspect the missing bit of context here is that we have a lot more potential sites than that we have archaeologists with the time and budget to investigate all of them.
So in programmer terms, most potential sites never make it out of the priority queue
Catch-22: since future archaeologists have better technology, no digs are performed right now—thus archaeological technology is not needed, and there is no pressure to improve it.
They had radar and geomagnetic mapping back in the 1990s, at least - Time team did ~250 digs that were broadcast on channel 4 and are now all on youtube, most in HD now.
And "geophysics" were used to decide what and where to dig in most of them. They're making new episodes now, as well.
Compared to a fully equipped and financed archeology team from today, which is not the case. Those who discovered the site know they are underequipped and underfunded for the specific site. In this case, reburying is cheap and effective.
Also, I'm guessing that the sand encasing the site is a temperature/climate controlled structure when buried properly. No sunlight and no air, for starters.