I think the concept of enthusiastic consent is still fundamentally a good one. First, it has more to do with stabbing the idea that “S/he didn’t say no in a clear enough way, so that must mean yes” through the heart rather than making some specific performance of enthusiasm a requirement. I don’t think it is ever bad to ask partners to look for signs of enthusiasm, consent, and full participation in a sex act rather than rather than assuming that anything goes if the person doesn’t fight them off. I think it’s especially useful for beginners, first-time partners, people in casual relationships to use enthusiastic, explicit consent as a guideline and save “good enough” for more established partnerships. If “enthusiasm” never describes how you personally feel about sex (asexuals, hello!) that’s okay, it doesn’t totally neutralize enthusiastic consent as a useful term