Why did some scientists do not agree that Tim white's discovery is 4.4 million years old?

Some scientists may not agree with Tim White's discovery being 4.4 million years old because dating methods can have some degree of uncertainty, leading to differing interpretations of the age. Additionally, new evidence or alternative interpretations of existing data could challenge the 4.4 million-year-old timeline. Scientific discourse and peer review are essential in resolving such discrepancies.