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To quote these notes from a (wireless?) network certification guide:

Most data applications in a Wi-Fi network can handle a layer 2 retransmission rate of up to 10 percent without any noticeable degradation in performance

Wi-Fi is not as reliable a network as Ethernet. For one thing, a microwave oven might not mess up your Ethernet, but it might mess up your Wi-Fi, at least if it's in the 2.4 GHz band rather than the 5 GHz band.