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Although 777 isn't recommended, as 755 is the accepted standard, the reasoning behind the use of 777 is that some servers don't allow writing to or creating folders using permissions of 755.
You do notice all those folders deal with temp files and caching so no critical files are to be found in those folders. In fact whatever data is put there only lasts for a short period of time.
So try putting those folders to 755 and if you don't have any issues than keep those permissions.
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