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So 7mm is the thinnest, what about the maximum upper limit for playability? 11? 12? 13 or 14mm? ...
7mm is usually thickness for either dual sided penhold blades (Sou MF P). The negative is they split easier, but this is still rare.
9mm is usal thickness for below flagship blades from top manufacturers if penhold or the flagship thickness for shakehand (any thicker and the racquet will struggle with overall thickness (17mm total thicnss with max rubber)
10.5mm is full thickess for penhold flagship blades such as KTS and RSM and is very fast.