When you delete your comment, you will be backed out of the post and see your feed. The problem is if you have "mark posts as read" and "hide read posts" set to true, then the post is hidden and you can't correct what lever mistake you might have been trying to fix, like posting a top level thread rather than a reply.

When you search, look at a single community, or look at similar screens, the hamburger menu is replaced by a back arrow to take you to the main feeds.

Sometimes I want to change some settings, send a message, or look at my inbox while on one of these pages without loosing my position. A great feature would be the ability to open the app menu without having to back out of your current screen.