Avoiding mechanics by standing in a singular area isnt an exploit, its possible bad dungeon design (for example the cage room in the newer flame and frost fractal
sorry I cant remember the name of the dungeon its late). In that fight there are areas in which you can avoid almost the entire fight mechanic, thats an example of poor dungeon mechanic design.
Standing on a rock/ledge/platform while the boss attempts to hit you from below (yes there are some bosses that still have abilities that hit you), is a problem with pathing and the boss not resetting when it cant reach the target. This is exploiting a bug.
Kiting and using geometry (running AROUND pillars and such) is a perfectly valid tactic.
Standing outside a stationary bosss range is not an exploit, the boss should reset after an extended period of time, but is not. This is an example of poor boss implementation, and not an exploit.
Using terrain to block/dodge boss mechanics is also considered a valid tactic (standing behind a pillar when a boss charges).
At this point we are getting very nitpicky at each individual boss and each mechanic in question. Im sure most of you are aware of what is an exploit and what is a mechanic/tactic. We are working on fixing these Safe Spots, but its going to take some time to get it done, and will probably happen over time. (Sorry I am not going to go into particulars for fights/changes)
Ill be very clear here:
If a GM finds a player that is using a Safe Spot, that player will be moved out of the safe spot and warned (via in-game text). If they are caught again, that account will be temporarily suspended.
If a GM finds a player that is using a Safe Spot and selling the dungeon run, that account will be temporarily suspended without warning.