Bad style, but any chance it would ever fail to update properly?

We've seen this before (and I did it 2 decades ago):  REPLACE MyTable.MyField with SomeOtherTable.SomeField

The implication is that "replace the MyField value in the MyTable table."  But if one doesn't use the IN clause, will there ever be any chance that the update to MyTable.MyField would fail?

tia, --Mike

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