All people are different; no two, not even twins are identical. The same goes for leaves, stones, individual animals, snowflakes, and most natural things. But electrons don't follow this rule, so that demands a special explanation.
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NL888 For him it would be simpler, more natural, less demanding of explanation, if ...He would find it simpler and more natural, and he would find that it required less explanation if ...
NL888"it" seems to refer to "all electrons were different from each other"Yes. More or less. Strictly speaking "it" is the proposition "if all electrons were different from each other".