Consider that hobbyists want every egg to hatch and being specific will maximize this. Also consider that when in the wild, a turtle has endless nesting possibilities, not just a few that might be provided in captivity. This means they'll be able to find a spot that will best meet the egg's needs to hatch.

What you have read about caring for your eggs likely targets two things.
1) To overcome the hazards of being layed indoors (ie, low humidity ect)
2) Again, to maximize the hatching rate, and perhaps to even determine the sex of the hatchlings with a specific temperature.

Ian

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