“Crooked” dice and fair RNG

Since last weekend’s game night I’ve been hearing the same claim: old dice were “wonky,” but modern games are fair because computers handle the randomness. I get the idea, but I’m not sure how true that is across the board. In our family runs we still see hot streaks and dry spells, which makes people suspicious. I’m after a clear, non-mathy explanation I can share with parents and cousins—something short that compares yesterday’s dice to today’s RNG without turning into a lecture.