Question about the function module (RFC_READ_TABLE)

Dear everyone

Could I ask you a question about the function module (RFC_READ_TABLE)?

I was asked if it's possible to create a report which compares the data between different SAP systems (both production systems).

Now, the easiest way would be to use the function module (RFC_READ_TABLE) within a SAP infoset query (SQ01 type query).

But I heard the rumor that using the function module (RFC_READ_TABLE) is not advisable due to the security reason.

However, I am not exactly sure what sort of security problems this function module can possibly have...

Would you help me on this?

I also would like to know if using "remote enabled module" type function module can always overcome this possible security issue.

Or, are there any points that I need to be careful about even when I use "remote enabled module" function module?

Thank you very much in advance.

Takashi