Edited to be more clear:
in the past, if you couldn't see a scent, you didn't know it existed. however now with XMPP notifications. you know a scent exists even if you only had a 1/100 chance of seeing it normally.
This makes stealth useless against organized villages. it will still work against noobs, as they do not use notifications.
i think the XMPP notification should only be sent if the owner of the plot passes the same scent test he would have had to in game. This would make stealth usefull again. and make it so valuble resource spots would actually have to be claimed by mains if they want to be notified offline of crimes by high stealth criminals.