I agree with your desire for greater transparency. Just this one point should be addressed.
When I have stated that the Dominate ability has been nerfed, I meant that its effectiveness in the current “meta” has decreased relative to the buffs to items of other characters, in particular by the addition of Restore effects on a variety of passives. The function of the Dominate ability has not been changed.
This might be best understood through the lens of direct effects and indirect effects. When the devs change the effects or stats of a particular equipment, this is a direct effect. In contrast, when the effect of an alteration on one item is to suppress the effectiveness of another piece of equipment, it acts as an indirect modification on that suppressed item.
So with dominate, when many restore effects were added to the game, dominate items and effects were not altered, but became weaker through an indirect effect.
I don’t think it would be reasonable to require the developers to disclose all indirect effects of their changes - a buff could be considered a nerf to all other unaffected equipment. Rather, they need to disclose where they made direct changes to how things work.
One place in particular where more transparency is necessary are these heroic adventure/test of might events. The fact that player’s max season trophy count was used to determine matchmaking originally was an example of the transparency I would expect.
The more recent silent change to adding 500 trophies to the season max at the start of the event, and 300-500 more for completion of each stage, and also correcting the trophy gain/loss algorithm are where the developers and community managers can improve their communication. It should not be left to the players to figure it out themselves.
Obfuscation does not work and instead erodes good will among the playerbase.