How can a cobdition which no longer exists be a current weakness in anything except your attempt to generalize from it to current reality?
> In the US, part of being a strong candidate means not only winning the Electoral College, but also winning a major party primary prior to that.
Obviously, winning a nominating contest is part of being a successful candidate, and there are contexts where that is relevant, and being a strog general election candidate is a subset of that.
However, when the context is general election strength, no, ability to win preceding nominating contests is immaterial.