You have a point about the evidence if you mean an earth as young as Usher's (the archbishop who thought the genealogy of Genesis was tight and contiguous). What 6days has not sorted out is the stage called 'formless and void' in which the window of time is wide open.
I believe the creative acts were six days. I find that when Moses bothers with details like evening and morning, he meant just that. But 'formless and void' is not being grasped by YECs even if they acknowledge that it is there and was the starting point. It is an expression that is about a complex backstory.
There are 5 features to earth when we first see it: formless, void, dark, deep waters, and the Spirit of God is not in it, but rather staying separate. All of these features, if researched through the rest of the OT, are indications of abandonment by God because of what was going on there. They are all things which are feared deeply in the Hebrew mind as indicators that God is not present, has not brought life and light. Jerusalem itself becomes 'formless and void' in its degeneration and destruction in the 8th century BC. Jer 4:23.
Turning to the NT, we find that the rebellious angels, Satan's pals, were sent off to 'blackest darkness' for confinement. This happened way before the formation of the earth we now have. It looks very much like our earth was one of these. In Job he moves freely throughout the world. In tangling with Christ, he claims authority to dispense with it as he wants. A lie, but lies are always based on some piece of truth, twisted.