We've had target painter and stealth traps and marked reveals which is a good start but too situational.
It doesn't solve the real problem of insane spike damage from stealth which allows for very little reaction time and makes for unhealthy gameplay.
The main issue here isn't the damage, but that stealth attacks have extremely reduced tells and gives opponents very little reaction time.
It is however easier for the damage to be reduced for stealth attacks across all classes and give some readily accessible counterplays, rather than to change the stealth mechanics for every class.
Give us a new WvW ability track to combat stealth.
WvW Stealth Mastery