Why are jumbo frames not enabled by default

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I understand that certain WAN connection cannot take jumbo frames, though for the rest of the network , why are they not enabled by default ?
 What if any are the disadvantages of  having Jumbo frames enabled at at the max MTU size 9216 on all ports on all switches.
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Rod Robertson

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Posted 3 years ago

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Bill Stritzinger, Alum

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Today there is not a penalty to turning on jumbo frames on all ports, those device that it cannot negotiate a larger MTU it will just negotiate and start talking. My usual base settings for configs are to  turn it for all ports all of the time.  

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Rahman Duran

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Enterasys gear has it enabled on all ports bu default as it seems. I don't remember If it is on Extreme gear.