Today i dod few runs in different dungeons as k/m tank and here are few of my toughts:
1. First of all this combo have really nice potential to be good tank, becouse of changes in skill Holy Light Domain(491628) during patch 10.4.0.2002.
2. Yet My toughts after few instances are that it lacks a bit of aggro boost in mentioned skill (aggro multiplier in skill)
3. Way to improve it could be for example aggrobuff dependent like the one in Truth Shield Bash(490186).
3a. Applying aggro multiply in Holy Light Domain(491628) looking same as in Truth Shield Bash(490186) where when you are under effect of Holy Power Explosion(490172) the aggro generated is much more impoved can be good in two ways.
4. First it can help while playing k/m tank a lot. Second it can help while playing k/m as dps (i know ight now noone is playing it like that) where you still can use Holy Light Domain(491628) as usefull AoE dmg skill and do not generate too much aggro.
I saw that currently main changes are focused on DPS class, but Tanks and (maybe mainly) Knight tanks should also get some love during class balance so they won't be considered as "weaker tank than champion tank".