"might prove problematic"
How about you help test the patch and provide replays or YouTube videos rather than typing pages of theory crafting on what "might" be UP or OP.
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I would be more than happy to join any winter balance game you create.
Providing videos on youtube unfortunately is counter productive since there is a part of the community that simple like to criticize other and attribute everything to the player providing the video. It simply does not worth the effort with current toxic level of the community.
As for "theory crafting" my skill in it good enough and I do not stay on paper I actually test thing, since each method has its merits. Time and again I have predicted many issues that would have remained unseen even via testing since they require specific conditions. The "theory crafting only" description is a simple malicious rumor spread by from specif user that seem to have a number of personal issues and completely wrong.
As an example I identified the problem with Conscripts DPS long before anyone could had become aware of via in game testing.
On the other hand I agree that the more Winter balance games are played the better picture everyone will get for value of the proposed changes.