Oct 14, 2016 its potential to provide an “implicit conversion operator” and in a syntax that, quite frankly, is far easier to recall than the implicit cast operator.

The short answer is that implicit operators are mostly about math. All other things being equal, method calls are easier to read, easier to maintain, and easier to 

public static bool operator !=( Variable varA, Variable varB ). More Effective C# (Includes Content Update Program): 50 Specific Ways to coerce a Contravariant structure into what is supposed to be an implicit conversion  There are, however, some typos and for anybody learning without a background in software this may be important. There's a typo on page 70. Implicit conversion  Cannot implicitly convert type 'System.Collections.Generic.List' to 'System.Collections.Generic.List