I don't know what or why Apple made changes to the IMAP behaviour since Mountain Lion. I am positive that Gmail IMAP is buggy and slow, irrespective of client, but it is true that if you bugger about long and hard enough, specially when you're on a slow connection and want to avoid the "All Mail" duplication, it can be done using settings of both Mail.app and Gmail. But the result still doesn't justify the added complication, IMO. YMMV.
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