Thanks for your comment.
As per Olivier, I accept that it can create security concerns (by activating services that reveal more information about the system or the bugs in respective programs).. but can you explain how does it impact system performance as per your understanding.
You should also consider that the service tree and nodes are hierarchical and cascade the authentication credentials.
Only activate those you need.
If a solution suggests activating everything then report it to SAP or to secure at sap dot com (security response team for internal security problems).