Because that isnt the best solution! It costs our company, (and sometimes our customers) around $50 for us sending a technition out to do that. Our job as phone tech support, is to try to solve the issue without costing the company or the customer more time or money than absolutly neccessary.
Therefore, if we can rule out (or in, for that matter) a bad NIC over the phone, by getting specific info from this command, that would help us troubleshoot more effectively, and avoid replacing NIC's that dont need to be replaced.