Why not use `const` as default? I would argue that using `let` instead is a premature optimization of readability.

It's easier to reason about a variable if you know it will always be one value—even if the value may be mutated (which is unfortunate).

`const` is a simpler construct. It has less rules and I would always suggest that using `let` will introduce complexity that only needs to be there when you can identify a genuine need to re-assign a value to your variable.

That said, I enjoyed the post. It's a good read!