One problem in the eyes of some employers is that person that completes a Cert IV Aeroskills then seeks employment must be paid at higher AME wage - if he can find employment - whilst his productivity and trade supervision requirement are probably at Year 2 or Year 3 apprentice level.
An apprentice commences on apprentice wages, 40% of Award tradesman's rate.
Having done an apprenticeship means absolutely nothing more than having worked for 3 or 4 years as a tradesman's assistant when it comes to applying for a licence.
I don't recall CASA ever accepted completion of an apprenticeship as qualification for an AME License? But an apprentice completes an SOE during his apprenticeship and should be able to pass basic engine and airframe licenses.
There is still no substitute for a traditional four year apprenticeship.