Why exactly is it a necessity to use infix on paper? And what exactly is the argument for using prefix just because we have computers? I'd argue quite the oppos

Why exactly is it a necessity to use infix on paper? And what exactly is the argument for using prefix just because we have computers? I'd argue quite the opposite, computers give use even more convenience to use whatever we like. I think it is a rather arbitrary choice, but it may relate to the prevalence of subject-verb-object in (spoken) languages; i.e., operators act like a verbs.