Why convert to object？

Hello all:

To make a study of Convert.ToDateTime with Just-Decompiler, I see this (for an example ONLY)：

 [CLSCompliant(false)]
        public static DateTime ToDateTime(uint value)
        {
            return ((IConvertible)(object)value).ToDateTime(null);
        }

My question is: since "value" is type of uint, and that has implemented the interface of "IConvertible", why don't write:

[CLSCompliant(false)]
        public static DateTime ToDateTime(uint value)
        {
            return ((IConvertible)value).ToDateTime(null);
        }

But cast convert to object?

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