Let's break down the two sides;
On one hand, allowing friendlying would decrease workload from having to deal with reports, of which through casual observation one can see there are many. This, in turn, would most likely allow staff to focus more on things people want implemented/fixes and allow for less headaches overall, (or so I assume, I can't say I've ever been a part of something as big as Skial's operation). This is probably a minimal change and won't affect much in reality, but its worth taking the minor amount of change into account regardless. Some of the player base would also be happy with this change as it allows for slightly more lax with this one specific rule being a bannable offense.
On the other hand, there are a lot of cons. One such issue that comes to mind immediately is what happens to all the players who have previously been banned for this offense? If they are to be unbanned, it may lead to an influx of appeals to deal with. This is only a temporary problem, if one at all however, and is more of a minor reason. Another reason is that servers already exist for this purpose, so what becomes the point of these servers should friendlying become allowed on others? I understand they can still be used for other things, but if there's already a place to be friendly, I don't see why it should need to be allowed everywhere. Lastly and probably the biggest reason to not allow friendlying is for the fact of the current times. Bots are plaguing casual, so smart players will choose to go to community servers to play the game normally, and if someone is looking to experience the game as it is, friendlies can be quite counter-intuitive to that. Some may argue that friendlies are also a part of the game, but usually the attitude of someone who leaves a game due to bots is going to be because they wish to experience the game as it was meant to be experienced, as most who queue for casual are looking for an experience different from that of trade or idle servers, as if this were not the case, they would already be on said servers. While these are three main reasons, there exist far more, but I don't feel I need to stress them as they are either known or have been previously stressed in this thread.
All in all, I'd personally say the cons outweigh the pros for this situation
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