From a purely theoretical point of view, there are things Newtonian physics and modern physics predict differently, particularly for very big or very small or v

From a purely theoretical point of view, there are things Newtonian physics and modern physics predict differently, particularly for very big or very small or very fast objects. So in that sense Einstein DID falsify Newton. What you're missing is Newtonian physics' subject was not very big or very small or very fast object so for the things scientists researched on, they predicted things quite well. But that only means they overfit to the universe around earth, and weren't able to model the universe in its entirety. Although you do have a good point, it's not true to say Einstein did not falsify Newton.