Would you also say that, "as an interviewer, if a candidate can use their buddy to give a better answer than other candidates, I'm not going to mark them down for using their buddy"?
Even if you don't mind that situation, shouldn't you get buddy's contact information and offer him the job?
That's not a great analogy: you can't do the job with your buddy; whereas some interviewers are ok with, and even expect you to, use GenAI on the job daily. Depends on the interviewer and job expectations.
A better analogy is an interview where you can use a calculator (and not be detected). If the interviewer were only to ask you simple arithmetic questions with numeric answers then sure you'd seem to do well. So interviewers adjust to not doing that.
Sure, and also split the dental and other benefits, vacations, and share one building fob, parking pass, cubicle and computer. Also, split the food at the company dinner. :)
Even if you don't mind that situation, shouldn't you get buddy's contact information and offer him the job?