Dem assumptions. I can say he never tried because Obito was there as well right?
This is funny. Itachi is dead. The bijuus are alive. They are completely different. Sasukes eyes belong to Itachi. He doesn't request ITachi's power. Your points are laughable at best. Hardly worth a reply but I'll humor them. What power did Naruto awaken on his own? nothing. Naruto has bijuu power no? then your post is moot at best. Moving on.
Sauske has already shown the power to cut something like the god tree branch with little ease. Adding PS sword powered by enton easily finishes the job. Where is the god tree known for it's durability in the 1st place. Tell me why Sasuke can't cut it down?
No, itachi's eyes are itachi. It was itachi that awoke that MS, not sasuke. That power doesn't belong to sasuke. Sasuke needed something that he couldn't achieve on his own. Just because the guy is dead, doesn't mean I can take what was his and say it's mine, because he is dead. Besides, he didn't transplant them alone, right?
Sage mode? Hum, gee, Idk.
The borrowed power "argument" is used by stupid people. In fact, had you seen my post, you would have seen that I defend both naruto and sasuke when someone says either of them has "borrowed power".
The writer made them that way, deal with it. Both naruto and sasuke had to endure a lot in order to achieve what they have. Sasuke had to devote his life to get his revenge, fight his own brother, in order to get that eye. Naruto had a life of suffering. Then he had to fight kurama and take part of that chakra. Then he had to befriend the bijuu.
They both deserver what they have. If you are so desperate that you need to downgrade a char so much, i don't give a damn. The "argument" is still stupid. Following that logic, everybody has borrowed power from the god tree.
Use something better if you want to prove a point.
And now we're back to the "If I can cut a branch, I can cut the tree argument". Because sasuke didn't display enough power. Obviously his PS is stronger than that version. But still, the whole tree, is a lot, a loooooot larger than that, and thus, way harder to cut. (Try breaking a small branch, and then the whole tree, tell me if it's the same).
We didn't get to see sasuke's PS slash, and in fact, even if it's equal to madara's, you can see that the god tree is much larger than those mountains.
Sasuke(EMS Sasuke) didn't display enough power to indicate he would be able to do that. Not so hard to conclude. Current sasuke would obviously do it. EMS sasuke didn't display enough, and that's someting you were unable to disprove.