But no employer has ever said "I just want an employee". So only someone naive in the extreme would imagine with the power dynamic in play the sales pitch isn't necessary. That a job is even advertised means the hardest part of the sell has already been done for you internally, but also probably has less favourable terms. If all you ever think is "I just want a job" you will almost always undersell yourself and have the worst jobs. The best ones aren't even advertised and are created purely on your own salesmanship.