Random vs. Random = more Randomness?

Original D&D dice from the red box. (probably 1983). Special dice are available for ages now, for longer than anyone would believe. They are not special any longer. 

Let that sink in: If you throw a dice to get a result in a fight, the result is completely random. So why should an opponent answer with another dice as a safe throw and produce another random result? The result of the first dice was already completely random anyway. Randomness can’t be enhanced. The first random result is 100% random. You can’t get more randomness, exactly like you can’t get more emptyness if something is already empty. There isn’t something like „a little bit dead“.  It’s absolute. True or False. Thats's it.

The only thing you can do is deduct from or add values to the result to pay respect to different situations, different enemies and other factors, changing the barrier for success. And if a 6-sided dice has range of numbers that is too small, use dice with larger numbers like D8, D10, D12, D20 or D100.  Or a combination.

But rolling random vs. random is complete nonsense. It only makes people roll dice more often and slows down games.

It may sound a bit heretical or daring, but sometimes I have the impression, that authors of wargame rules try to keep players busy to let it look like they are doing something. Or is it to give the safe throwing player the feeling that he/she is not helpless? Or is it simply the - to me - strange "fun" that some people have when they use dice? I read that from time to time and always wonder how this very simple thing tickles peoples brains.

By the way : Did you also notice that wargamers always look for faster and simpler rules, but always land in another elaborated mess of dice & tables?