"..a Ranger isn't a Ranger if he can track.." I assume you mean "..a Ranger isn't a Ranger if he can't track" .. in which case I agree totally .. Rangers are one with the wilderness in my opinion and as such should be capable of such things..
Squenix knows this, at lv.10 the Ranger gets the ability widscan.. this ability allows the Ranger to search the surrounding area for all NPCs/Monsters and then marks their place on the map and adds then to a pop-up list on the left side of the screen..
Selecting a monster from the list will give you the option to "track" it .. choosing to track a particular monster will provide you with an arrow on your compass pointing in the direction of the monster/npc you seek..
Another use of tracking occurs when someone near you calls for help .. the the name of the monster will appear at the bottom left area of your screen and an arrow pointing in the direction of said monster will appear on your compass allowing for a swift rescue above the capability of all other jobs excluding the BeastMaster who also gets tracking and widescan (just not at the potentcy of the Ranger)..
The main use of widescan/track would be for farming 1 sort of monster or for hunting NM (Notorious Monsters) which there are only one of and roam about the map a bit .. with widescan a ranger could run in, find the culprit, and swiftly misplace an arrow in the back of its skull much faster then any other job including BeastMaster since the Ranger's widescan has a larger range of view
so in short .. yea .. uh .. they gots the trizzackin yo