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That's what I call nitpicking. Yes, an element will have a varying atomic weight due to the difference which occur between isotopes of that element, but the basal element (i.e. C12, O16, N14) have a precise weight and are the ones that are used in chemistry. All they're doing here is saying "Oh, if you're going to do this and that, you'll need to use the precise isotope weight for the situation". Carbon, whether it's C12, 13 or 14, will still react chemically in the same manner, it's just that certain isotopes are favoured in various reactions due to their mass...lighter isotopes are easier to remove, energywise, than heavier ones.
Splitting the periodic table up into more groups than is necessary is just a waste of time. It's not being more precise, it's just being pendantic.
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