I thought the menu icon (that takes you to main page) is part of the lower tabs list which is always visible and no matter what level down you are at, clicking on it will take you straight to first page.
I have the same problem. My UX gets deep in some places and to get out, it can be a series of 5+ clicks on the back button. I’m relying on users to click one of the bottom menu items to jump out but it’s not ideal!
Despite the problem, which I thought was my own, I find comfort knowing that, even amongst an occasionally intimidating forest of mental giants, I am not alone.