Lock pages in memory and Virtual SQL Server
From your description it seems like things are fine for you even when LPIM privilege is their for SQL Server service account. If things are fine why do you want to change it I suggest you keep it like this.

Now LPIM protects paging of SQL Server process, so unless you have mis-configured VM host or some other applications running on OS which can leak or "Pull" memory from OS LPIM is actually not required. I as well believe that normally on VMware SQL Server should not be given LPIM unless required and forced by Ballooning or other application pulling memory unnecessarily. VMware ballooning is feature which should not be disabled but the VM host should be configured such that memory is balanced most of the time.

Quoting From Vmware Online Doc


  When setting the SQL Server Lock Pages in Memory user right, the
  virtual machine’s memory reservation should also be set to match the
  amount of the provision memory. Setting virtual machine memory
  reservations prevent the balloon driver from inflating into the SQL
  Server virtual machine’s memory space. Lock Pages in Memory should
  also be used in conjunction with the Max Server Memory setting to
  avoid SQL Server taking over all memory on the virtual machine.


Moral: If you are not seeing any anomaly after enabling LPIM I suggest you leave it as it is but before doing this speak to your VMware admin and make sure the VMware configuration is correct