Replacing development system with copy of production system during upgrade

Hello Guru,
We are planning to replace our development ECC 5.0 system with a copy of production system, and to perform upgrade to ECC 6.0.
SAP upgrade guide stating that:
"If you have modified SAP objects, make sure that you keep your development sysetem.  Do not copy your production  system to your development system for test purpose."
If we are planning to "Reset to original" for majority of SAP's objects during SPAU, are there other reasons we need to consider the impact of replacing development system with a copy of production system?
Thanks in advance!

Thanks for your response. 
When we first implemented SAP system 3 and half years ago, the consultants and the developers were using the development system like a sandbox system, they tried out features or developed programs for learning purpose.
Hence, the development system and production system are very different.  
There are many repair transport requests that will never transport into production.
Also, we developed client strategy (different client numbers for each system u2013 Dev, QA, Prod) during the initial implementation.  
We were told by the upgrade consultant, it is standard that the development system replaced by a copy of production system during upgrade.  The client number in development system will be the same as the production system after upgrade.  If I want to avoid confusion for the developer & testing users, I would have to create a new client using the previous development client number, and then perform client copy.
As I review the SAP upgrade guide, I saw the statement about not to replace development system with production system, I would like to know the reasons behind SAP's statement.
By the way, we will replace our QA system with a copy of production system during the upgrade.

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