Here's the problem, there's an established 'story' and if someone tries to go against that established 'story' about human history, they will find themselves unemployable. They will not be permitted to be a part of digs, they will not be able to find grant money, they will not be able to find a university that will take them in.
If someone finds something that even adds doubt it's immediately labeled a misinterpretation, a fake, some natural process that resembles human activity etc.
Add to that if you go back to Toba supervolcano 70,000 years ago you wipe out most of the human population at the time with some estimates getting you into a few thousand humans across the entire planet which obviously could have ended societies that did exist at the time and were not nomadic, if they were using largely grass and wood for their construction, a supervolcano erupting could have quickly led to using construction materials for heat source, as a source of food for any animals that were struggling to find food etc. Even small settlements spread out might go undiscovered by archaeologists for centuries.
If you look at Kenya’s Olorgesailie Basin there's potentially evidence of tool building 320,000 years ago. That right there kinda takes everything and goes "yeahhhhhhhhhh we're probably wrong" https://www.popularmechanics.com/science/archaeology/a194478...
Telling me we had tools 320k years ago but we didn't figure out agriculture until 12-14k years ago? Heh. Ssssssure.
I urge anyone to go read about the history of archaeology, it's only until extremely recently (the mid 1900's) that it even started to become a proper science and even then most of the labor was untrained volunteer and many an important site were discovered by people native to the area before properly trained people were notified and brought in.
Even recorded history is extremely suspect until very modern times. Some will argue it didn't become reliable until the 11th-12th century but we still see instances of stuff unreliable past that. Some firmly believe Joan of Arc is a fabrication for example, which calls 15th century 'history' into question... when someone questions her existence with logic they are quickly called a 'revisionist' and considered a nutjob though.
The fact that 'revisionist' and 'historical revisionism' exist as concepts are troubling because they are often used disparagingly of anyone that questions the 'official story' where in other disciplines it would be considered healthy skepticism.