I don't want a rigorous proof of gauss's law but, I cant understand why only symmetric charge distributions are found their application in Gauss's law.
A source says;
Now imagine a sphere that is not uniformly charged. Suppose there is more charge on one side of the sphere than the other. This is a situation where Gauss' law probably won't be very useful in calculating the electric field.
Why is this so?? Reference https://www.physicsforums.com/threads/gauss-law-symmetry-of-charge-distribution.379052/