You’re asking about rolling dice versus counting dice. While it’s not very obvious with a six sided dice, a 20- sided die is usually put together the same way, so that opposing sides sum to the same number, and adjacent sides are farther apart. Some such die have numbers next to each other so it’s easy to turn the top face from 20 to 19 to 18, etc. With some practice, you could roll the counting die to give your preferred high or low result.
Mostly it’s just tradition. It actually can affect the odds, if you aren’t careful about distributing the die’s mass evenly among all six sides, which is why casinos fill in their dice’s holes using a resin of the same density used to make the dice themselves. But for most gaming dice, the effect isn’t large enough for people to care about.
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