Well, but the theory that "the world only consists of atoms and void" is false (waves), that the "universe is infinite" (it only expands really fast, but it has a border), that the multitude of atoms is infinite (we've only a few types of quarks and bosons), etc..... so I wouldn't call EP coherent by today's standards. Sadly
Ancient atomic theory is the basis for modern physics. The fact that the theory has evolved over 2300 years doesn't, for me, discredit the original theory, particularly since the original theory was conceived without the benefit of modern technology.
I'm not aware of the universe having a border, only that there is a limit to what we can perceive due to the speed of light. But maybe Martin has more to add to that.
According to Epicurus the multitude of atoms is infinite but the types of atoms are uncountable but not unlimited. So I assume what you're referring to is the "uncountable" types of atoms, not the overall quantity of atoms.
Atomic theory, to my understanding, is validated as the ancient theory of physics that is most in line with our current understanding of the universe.
The book God and the Atom by Victor Stenger provides a history of the the development of atomic theory from Democritus to fairly recently. There are many others, this one in particular is not Epicurean but favorable to Epicurean theory.