I agree that the essence of the country remained the same despite his reforms. But in the Europe of that age, there was always a divide between classes so there might have been no change for all the classes unless there was no divide. The Europe of that age was also violent, and if Peter the great was so were many others, how true. He perhaps did make only superficial reforms, but for Russia, they were great reforms indeed, whether surface, or affecting culture, or just the upper class. So they cannot be discounted. He did cause misery, but in the long run if not the short his changes were not superficial. But in the short run, they may have been largely cosmetic, and superficial.
I think Sophia would also have directed Rusia towards change, but less radically than Peter. She wasn't as bad as she was cut out to be, doubtless. She was in a bad time for being a strong woman, who might have steered a middle course, perhaps the best way for Russia. Her whole reign was volatile, and mixed bad/good, but if it had not been volatile, perhaps she could have accomplished more.