You say “a company this size” it’s still a fairly small company. Not to mention all of the errors you listed are client side.
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Last time i checked this company had over 600 people working there. and from any of the error code explanations, it could be both client side or server side. all i know i did not have a single dc when i played this from the battle.net launcher. and nothing's changed on my side
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So 600 vs a company like Activision with 4,000+. You realize how small of a number is for 600 to make a AAA title right?