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It may not be what you were implying, but if the argument is "vipper was right all along, but isnt listened to (hence why he has to repeat himself)" then these two examples dont really have to do with that.
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First of all, imo, a very large portion of people posting here (some post here for other reasons) and the balance team all have the same goal. To improve the game. The fact that we disagree on how, is not really an issue.
I am under no illusion that I am always right and the fact that the majority of my post start with "in my opinion" reflect that.
The reason that repeat some things has to do more with the fact what imo are mistakes are being repeated.
Increasing the DPS of unit to make the more attractive has been used as a solution again and again and the results where mediocre. Osttuppen got LMg and they still are not much better in late game, Stormtroopers got a major DPS buff and they still are not that great either just to name a few.
On the other hand Ostheer artillery officer with diversion ability is in much better place than assault grenadiers although his comes with only 4 Mp40s.
The other examples I certainly cant disagree with though. Sector assault and jli made it through long (though by no means dense) stretches of testing. That said, its not like you werent heard. There are a lot of voices in the community. The majority was fine with jli and sector assault until it hit live. The majority was fine with valentines for a fair bit AFTER they hit live (see the post revamp poll). Having ones opinions heard doesnt necessarily mean getting ones way; that would be paradoxical with the sheer number of opinions.
The fact that broken abilities like Sector assault/JLI make it thru has more with trying to change too many thing at same time than anything else. That actually slow downs the balance process more than if someone made sure that the changes one introduces are solid.
I am certain that my opinion is being heard along with opinions of everyone else because, especially since many changes that I brought up (like the damage reduction for Dozer/Kv-2) do actually make it in live and I hold no grudge for the points I make that are not implemented.
I have vision of direction the game should be taken and I am sure that every member of the moderation team also has one. But I do think that I should point out directions that work or do not work even if that mean repeating myself, especially when direction that I consider wrong are taken.
(at least until directions are tested and are proven inferior to other solutions)