But in that case you would need a button to ask for the current speed or something like this.
In real life you could just take a peek to the side at the gauges, in the game this would involve going away from the periscope screen and would be more complicated. So some readouts on the bottom bar are actually closer to a RL experience even when you don't have them in RL.
So some stylishly looking readouts are not unrealistic but rather unfitting. Its more a question of style, taste, immersion than of realism.
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