If I remember correctly, this is because of a fear that Part M Organisations may be given the responsibility to Sign-Off the final CRS's - not a Part 145 Organisation.
This means that the operators (probably sitting in a Maintrol Office) can sign off their aircraft without using Line Engineers. No use of Line Engineers for this task means less Line Engineers...
If this system works it will undoubtedly be rolled out across many other areas and replace (CAT B) Line Maintenance Technicians for task-trained (CAT A) Mechanics at best. At worst all Licences could disapear and be replaced by locally trained and company approved mechanics, unable to move jobs without losing pay rates (loss of freedom of movement)
...I think!