vserver ALWAYS replies to ping

Deb says iQuery should be used to monitor an LTM's VS from a GTM, and I've read that in a few other places too. Unfortunately we set up our GTM's to use application specific health monitors, the generic HTTPS and ICMP monitors that come with GTM. I'm having trouble understanding whether its "required", "highly recommended", or just "optional" to use iQuery from GTM to LTM. Our LTM's have hundreds of VS's, but I only need to monitor one of them from GTM, so I thought it was overkill to import the status of the many for the needs of the one. Is there a short list of the bad things that can happen if I'm not using iQuery from GTM to LTM?