I like this better overall. Just the amount of screen real estate taken up by bars like it usually leads to me getting frustrated while reading even when occasionally useful. If it allows us to fix these bugs as well then I think it's more plus then minus.

I may have just missed something but I'm slightly confused about what you mean by occasional auto pop ups?

Some apps (like the Amazon Kindle iOS and Android apps) have floating toolbars which hide during normal reading, and pop back up when you activate menus or tap on an empty part of the screen.

These could then hide themselves again when you start scrolling or tap again outside the bar.

Can be handy for still getting at the toolbars, while keeping them out of the way most of the time.

-- brion