After sql server 2012 installation, I have changed sql server database engine service account from network service user to system user. What is disadvantages of this process?

     After
sql server 2012 installation, I   attached my production db. Because of some reasons, i
changed sql engine account from network service user to system user by means of sql server configuration manager.
     Now , there isn’t
a problem at sql server running system. But
I have doubts that
this can produce problems later. Because sql server database engine account must have privileges that listed below;
Log on as a service (SeServiceLogonRight)
Replace a process-level token (SeAssignPrimaryTokenPrivilege)
Bypass traverse checking (SeChangeNotifyPrivilege)
Adjust memory quotas for a process
(SeIncreaseQuotaPrivilege)
Permission to start SQL Writer
Permission to read the Event Log service
Permission to read the Remote Procedure Call service
While sql server installation, setup gives these
privileges to network service user automatically, but changing user by means of sql confugarition manager does not give these
privileges.
Now, system user has privileges listed below. And sql server has been running for 1,5 months without any problems.
Log on as a service (SeServiceLogonRight)
     Bypass traverse checking
(SeChangeNotifyPrivilege) (Everyone user has his privileges. So i think that system user has this privilege also)
What problems can occur because of this situation? Shall i give other privileges to system user and restart sql server or not? And how can i give these privileges to system user listed below;
Replace a process-level token (
this can be set from user rights assignments)
Adjust memory quotas for a process
(this can be set from user rights assignments)
Permission to start SQL Writer (
? - give advice )
Permission to read the Event Log service (
? - give advice )
Permission to read the Remote Procedure Call service (
? - give advice )

Our server is windows server 2008 r2 enterprise edition. I have looked the bunch of permissions in user rights menu that is in local security policy settings gui.
And i have seen those permissions below were not granted to system user;
Bypass traverse checking (SeChangeNotifyPrivilege)
Adjust memory quotas for a process
(SeIncreaseQuotaPrivilege)
So, briefly you say, don't panic ?

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After sql server 2012 installation, I have changed sql server database engine service account from network service user to system user. What is disadvantages of this process?

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