> By default devices don't send fragmented frames. This means that the mixed key attack and the fragment cache attack, on their own, will be hard to exploit in practice, unless Wi-Fi 6 is used. When using Wi-Fi 6, which is based on the 802.11ax standard, a device may dynamically fragment frames to fill up available airtime.

Why does this feel like Spectre? We're trying to speed things up in a way that eventually blows back into our face.