not at all. the content of course is disclosed, that's just ok or else it would be encrypted.
however your use of the content is private matter too. that's as safe as it could be on local storage if using a respectful client. of course this includes also your full contact list, your habits, location and probably system and device information, if not more. this is inevitably leaked with any imaginable online client, and if you also choose gmail that's an explicit statement that privacy means shit to you. note: your's and your contact's.
just saying, not wanting to argue or playing right-minded. i just can't get used to the way people boldly dismiss this issue, as if it made it nonexistent. the fact that lots of people tend to do will have have far reaching impact on society, already has. people should be made aware, not misinformed. then they can do as they please, and of course take responsibility.