Why would you assume that they would operate under our understanding of the laws of physics? Heck, scientists struggle to document and trace our own history, or are unable to explain why and how we have massive structures that would be problematic to replicate today. Your assumption is based on what WE understand, but perhaps not on what is truly accurate.
While science is an work in progress what you are expecting is a fundamental reworking of every aspect of advanced physics of the universe.
And with absolutely no evidence whatsoever. What you are asking to believe in magic.
To believe the “Ancient Astronaut Theory” is to believe, without getting into the physics impossibly of it but just the common sense of it, is these *aliens” they claim influenced every important aspect of human development yet left absolutely no evidence of the technology of which was needed to achieve it.
They built spaceships that had zero failure rate so bits of destroyed ships made impossible metallurgy by humans are never found? They have perfect actions so 100 percent collection of the most mundane tools so none would be found by humans later?
Yet their “presence” is everywhere in our history and in the present yet all we get are fuzzy pictures and fantastic stories of people claiming to be studied by aliens with anal proves and impregnate with space babies.
As it was said by somebody wiser than it.
“Extraordinary claims demands extraordinary evidence”
And the “Alien Astronaut” crowd are long on the former and sorely lacking in the latter.