I do understand his point. If you want content to be long-lived, requiring the execution of code to render it introduces a risk that it will become much more difficult to correctly render in future, if it's not maintained and updated.
I think it's a valid point to raise, but how much you care about it is going to depend hugely on what you're doing.
I think it's a valid point to raise, but how much you care about it is going to depend hugely on what you're doing.