I found this fascinating, if true:
> The reason casino dice have such sharp edges is to get the to stop rolling faster with fewer tumbling. The more a die tumbles the more likely it will present any issues with it.
If I understand it correctly, the justification is this: if a die is biased (usually a heavier face), this bias will manifest with a higher chance the longer the die rolls. But if it stops abruptly, for whatever reason (bumping against the edge of the table, other dice, or having a shape that prevents longer roll time, like the casino dice) this bias will be less likely to manifest. Did I get this explanation right?
I have quite a few sets of dice for D&D, nearly all of which favour aesthetics over balance. But saying that I prefer to use simpler plastic with rounded edges at a table. Sharp edge dice stop very abruptly and tend to show bias based on how they were held. The same is true of metal dice which are heavier, and tend to land instead of roll. This isn’t really the outcome you want.
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That's how I understand it as well :)
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