Is it just me? I feel this is confused and adding complexity in some areas, not genuinely optimal for simplicity. I tend to feel that unexpected, unrecoverable

Is it just me? I feel this is confused and adding complexity in some areas, not genuinely optimal for simplicity. I tend to feel that unexpected, unrecoverable exceptions are best treated as just that -- exceptions. Applying a C-style function return value check seems backwards. And the "Interpreter"?? Proper purpose of Interpreter or DSL is for dynamic (configurable or user-input) code, not to implement basic sequential flow and the 'if' statement which the underlying language already provides.