BoA prevents you from short circuiting progression by skipping over large chunks of it in huge leaps with trading instead of smaller steps from actually playing the game. You might think this is bad, but that's the same as a small child thinking its bad not having chocolate cake for breakfast even when its obviously not a good idea.
Its not about ruining the game for you. It's about preserving the spirit and intent of the game for everyone and keeping it fun for as long as possible. Unless you'd rather be geared out in 3 months with no desire to play any of the new content since all drops suck and you already have all 6 characters clearing torment 5 and start complaining how blizzard keeps making the game too easy?(is this what pro traders really want? A massive pointless E-peen gear competition?)
so your argument is that you know better than us and that trading, which has been in diablo since day 1 so go away because you say so. (that I can't have chocolate cake for breakfast?)
face it. you can play without trading just fine. your just want all of us to be forced to play the same way as you.
what we do is our own business, if the drops are balanced around a self found player (loot 2.0 claims this), then what we do won't affect you.
If trading for the best
items in the game is the best or easiest way to get them, then everyone who traded would be getting those items the fastest compared to everyone else. I think we can agree that as fact. Now all of these players would have a distinct advantage over all other players in terms of farming gear, gaining paragon levels, progressing in general since they had the fastest way to get the best loot. Would you agree that this is factual?
These players would likely base their online interactions on the qualities that upper tier of loot provides. Looking for torment 5 groups, doing speed runs, 500k+ Dps only groups, capped MF only groups, looking only for max rolled legendaries in game etc. Any player who could not meet these requirements would be negatively affecting their efficacy so they would likely be generally avoided. Essentially, if you didn't trade if you were able, you would not only be at a distinct disadvantage in terms of progression, you would likely not have as positive an online experience with other players overall.
So now add into this situation the botters and 3rd party sellers. Suddenly all players are faced with the prospect that the best and most efficient way to play is to buy your gear, lest you fall behind and online play becomes less enjoyable. So we are back to the pay-2-win gameplay that we have at the moment. Its at this point where pay to win trumps the actual fun of the game, and indeed lessens the games life span.
Sure you could just ignore all of this, but then you are segregated into this "self found" category, you have less fun as a result unless you stick to playing with other self founders. And for what? So pro-traders have more fun? At the cost of the overall enjoyment of the game for themselves included? In one years time how many will have gotten bored and quit? Are you saying that a smaller population in-game will not effect me in the slightest? What about if/when PvP is finally released? What if the game becomes so easy they boost the difficulty or adjust other systems to please the trading population? The player base becomes even more divided, the traders and the "self founders" each playing on separate levels from each other, each group not able to interact with the other as well. Even among the traders those who pay for items would be on yet another level.
Naturally this segregation will all happen on its own eventually without trading, but the time required would be so much higher with BoA. The game would last longer, years even. For everyone. But once you get to the "everyone has an enigma" state of the game, its kinda pointless to farm. Its kinda pointless to play unless you ignore the entire community and play it solo or you join in on the "fun" and get the duped enigmas(in this case, traded or bought BiS legendaries) and go back to ignoring the whole reason to play. Kill monsters, get awesome loot.
There are many things that can be said in support of BoA. The only argument against it I hear is that you shouldn't be forced to play the way I do. But why should I be forced to play the way you want? Saying that I can ignore trading if I want to is ignoring the fact that it will
affect my game negatively in one way or another. Currently anyone can simply ignore the AH, yet it exists and it was a large factor in the overall failure of vanilla D3, so much so that when it was announced that it was being removed the vast majority praised the decision. And simply arguing that trading has just always been there in it's defense is pretty weak. We used to just always live in caves banging rocks together and hunting with sticks, so why did we change? It made things better. BoA will make things better. Not because I say so, because its the truth even if many don't know it.