It is designed to be able to skip the "tier up JIT" stage that JS code has to go through, where JS code is profiled at runtime to decide what should be optimized, what the types are, etc. `1 + 1` in JS and `(i32.add (i32.const 1) (i32.const 1))` should still result in the same cpu code, the only difference is that it takes longer for the JS code to get there (and there's no guarantee that it happens to the JS code).

(and yes I know, the addition would be constant folded, it's just an example okay)