NO.

Simply, not.

This is not something that would affect PvP only, it also affects PvE.
Some melees who hate camera locking (Hi, me here) have macros to spam face target so we don't miss auto attacks while moving, and thus, we don't lose DPS that is so valuable in raids. Basically, camera locking is awful, gives me tunnel vision and I can't trespass a monster or boss hitbox but just circle around... Makes me clumsy in mechanics so I decided to stop using it, but the difference of not using it makes you lose 50-100 DPS because auto attacks (At least in monk) and you can't afford that, so I made my own method, facetarget spam. Now I'm not in disadvantage with camera lockers, all the opposite.

Also, I still thinking, if someone gets the effort to spam that, why not? They should stop the third programs, but, using macros to spam the facetarget is totally legit. (I don't have any macro just in order to not stop my facetarget macro, as, other macros would interrupt it).

PS: I'm pretty surprised you noticed all the benefits about it, too bad you decided to comment, I hope SE won't take this in mind, (Can't help, I have to be honest) because it affects me straight, mostly in PvE. (In PvP with a single facetarget per casting is enough for me. )