Interestingly that Yahtzee version was rigged in the player's favor since they're more likely to get X-of-a-kind if the same numbers appear more often. Average scores probably dropped a decent bit after that fix.
For the short time that I knew about it and it was not fixed yet, I integrated it into my strategy. 1 and 6 are rare, so if for example I still needed them for something, I was inclined to make good use of 1 and 6 when they came up, instead of rerolling them for something else.