As far as I know, it can't be removed from the dash. It can be removed from the HUD and central display as those are additional places where it can be shown if desired, but to the best of my knowledge, it's always displayed in the instrument cluster, unless MB added an additional setting in later models. What you can disable is the visual/audible warning if the speed limit is exceeded. To be honest, it's not about being law-abiding. Everybody can inadvertently exceed the speed limit, or miss a speed limit sign, so it's kinda handy to see it in the instrument cluster if you are not quite sure what the speed limit is on the current road.