Future employers who will automatically reject many because of their shoddy resumes will ask questions of those that get past the front door and will be further filtered by the way they speak and behave and dress let alone having real qualifications.
As a Trades Supervisor I advocated for a minimum 2 year probation period (the existing one was just 6 months), written and practical tests appropriate for the the specific trade, and minimum passing grades of 90%.
Needless to say the company (a school district) rejected my proposals for a more professional work force.