One potential problem when running Koha is that someone can create a report that makes the database really slow and/or crash. This will be mitigated to some extent by bug 33116, but for sites that have a setup where the database is replicated to a second database server, it could be interesting to be able to direct queries generated by reports to the replica, not to the main server. Then a heavy/slow/big report would only affect the replica, not the main database.