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I firmly believe that if you’re paying for a product it should work correctly
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The crux is that not every computer science problem can be fixed with money.
Think of the engine as avery very complex finite state automaton.
Requesting now that the engine “shall handle all possible forms of input”, then you are asking for a program that solves the halting program.
I dont know about your background, but just look look up things like “Turing machiine”, “Halting/decission problem” and “Gödels theoreme of incompleteness”.
For any machine that is capable of handling natural numbers (and UE is certainly cabable of that and way more…), there exist input patterns that transition the machine into an undefined state.
Even the C++ compiler is not above that principle. Who says I cant trigger a buffer overflow with my assets. In C its pretty easy to exploit gets() for example…