How Important Is a Confirmation Letter in Reducing Attrition and Ensuring Performance?

I have a very important question to ask. My company follows a deemed confirmation process. I recommended they remove deemed confirmation since most employees look for an appropriate probationary review followed by a confirmation letter. Also, the company is facing a higher level of attrition because employees know they will get confirmed even if they don't perform. To reduce attrition and confirm employees who are performing, I suggested this change. However, they are of the opinion that deemed confirmation should stay as it will increase paperwork and time consumption of the probationary review. They also believe that other companies follow the same practice.

Importance of a Confirmation Letter

So my question is, how important is it to give a confirmation letter? Why? How do I convince my management?

Addressing Attrition with Written Confirmation

How will a written confirmation address the problem of attrition? On the other hand, if you extend the probation of an employee after review, they may be in an advantageous position to leave the organization with a lesser notice period, as is normally the case with terms of employment during probation. You need to ascertain the actual reasons for attrition and address them.

Regards,
B. Saikumar