In watching (or reading the transcripts) of discussions on balance and design there is a lot of focus on Passive effects in comparison to active effect and often a passive effect of one Profession is labeled a problem, but similar effects on a different profession seem to be intended and not a problem.
To get to the question what is the criteria of passive effect to flag it for a problem?
The current stance seems often based on the idea of counterplay, but that does not really explain why some passive manage to be on the chopping block while others remained untouched.
Pets have been hidden due to rising Player complaints.