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As they say, let personal opinions remain personal opinions. Wouldn't it be great to observe the entire situation as a whole? This is what represents the main interest for me and many others (many have already spoken about the demand for an observer mode) in matches – not micromanaging zombies and dwarves, but the strategic aspect, which is not properly visible in streams. That's why no one wants to watch XL+U because it's hard to figure out what's going on. With an observer mode, it would be completely different.
Moreover, with an observer mode, viewers will have the opportunity to watch any game of any tournament (and not only), which is already very cool, because even the finals are not always streamed at the moment.