While you were writing I just made an edit to my comment, yep I meant everywhere, post or comment section. An idea is to have options in the settings for “everywhere right swipe = back” and if that is on then an option for left swipe: comment OR up/downvote. Thank you for even considering this, this got my hopes up! 😊

Also the tab bar idea is cool, I just can’t imagine the feeling of it yet. And hope it doesn’t interfere with iOSs swipe bar for app switching.