That's not true. We used to collect client and server data both to detect issues and even if it was only in a subset of customers there is just some customer facing QoS issues you wouldn't find unless you were collecting data, that wouldn't be found on server side for example. Like let's say iPhones make an update and you're doing video streaming, maybe certain video formats would lag when streaming to the player but not on an android or vice versa.
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