Nope. Implicit conversion can be a problem on just about any data type. Elimination of implicit conversion would be the only way to handle that, and implicit conversion has too many good uses to get rid of it because of people who don't learn how to handle it correctly.
- GSquared
Despite the fact that implicit conversion maybe good or bad, varchar(max) is a not the same type as varchar(N), 0<=N<=8000 .. something to keep in mind!