I did read what you said. It acts almost exactly like a raid marker. Everyone that has the mod that is in range of said healer WILL see the + pop up on the nameplate. You are ignoring that. The mod identifies healers the enemy hasn't even noticed by automatically putting a mark on them. For druids, they used to be able to change to kitty/bear form and hide their healer status. No longer with this thing. They stay marked.
I would being dense if I said it's a raid marker over and over and over and over and over and over and over and over and over and over without actually provide a insight of it. Out of 5 features HTTD have, only 1 is the same as raid marking, that is they are markers. You cannot say they are the same thing, it's innacurate to say so. Would you say a bat is a bird because it flies? No, that's wrong. I have not a problem with people saying it's overpowered because it is a marker and explain why a marker in PvP is overpowered. But to say is the same thing as a raid marker and because of that it should be banned is not an argument. For two main resons:
1) It's not the same thing as a raid marker. Out of 5 features, one is similar. Thats 20%. This cannot be a definition of similarity not even by the most insane of people. Say it is the samething as raid marker is just wrong.
2) This argument is based on the logic that as Blizzard took raid marker out of PvP, and therefore for the sake of not being hypocritical, they should break HTTD. This argument fails because the reason to why blizzard disabled raid marking isn't clear. You could say it was because they didn't want marking, you could say it was abuse, you could say because it marked peple over nameplate range. You cannot come up with a objective reason to it until Blizzard come up with something, until there, this notion is totally subjective. And it's not even a strong argument anyways because blizzard can change their plans for PvP anytime and add raid markers again, the state of PvP back then is way different than now. Till they talk something about it, this argument don't hold any strength of its own at all.
And people being single out is also subjective. I also thought at first the addon had aggravated the scene for healers, I won't account people testimony as a lie, that's why I thought this way. But given the numbers, that's not likely. 50000 downloads doesn't even hold 5% of WoW's population, and of this 50000 downloads, at least one third must be updating, making the number lower than this. And that this less than 5% WoW demographic would be entering the same BG together, move together through the same point of attack, and use the add-on to attack the healer as soon as he lays a heal (which means their addon is tunned to count any heal), and that this 5% is griefing the healer community is just a long long long long shot. If probabilistics say so, than is more likely that this is a selfconcious state. They're are being single out, and being frustrated by it, and in the search to find a reason to this, they use HTTD as the scapegoat. Healers have always being singled out, at bad rates as people tell, 3-5 enemy players following you. And notice this, people that are complaining are usually working through this line "ahhh, that is why I was being single out so fast then", this is even a stronger indicative for selfconscious behaviour, they didn't actually come in with real data, just a subjetive account. And if this add-on was really really griefing the healer community you would see much, I tell ya, much more massive
complaining than this. This topic would have reached 26 page limit in one day. But this did not happen, the actual numbers don't change nothing substantially.
The only strong argument I have seen here in favor of breaking is that this is a marking, this is singling out one type of class and this is overpowered. No appeal to Blizzard or emotional frustration. I think if you wanna come up with something convincing you have to work through this line. And for people thinking like that I have a question for you.
If singling out healers (marking them) is a problem, then you wouldn't care if it marked every class role? I mean every class role, marked DPSers with a Red Sword, Healers with a White Cross, and Tank Spec'ed PvPers with a Brown Shield?