That’s great, I’m glad you’re enjoying it and finding it useful. I think that’s one of the benefits of the TB - bringing to light useful features people may not know the shortcuts to.
By which I just mean, well let’s use your examples. Autocorrect happens as you type anyway and can actually be customised quite a bit to make life easier, but bringing up alternatives on the TB can be handy.
The volume shortcuts have been on standard keyboards for donkey’s, so we’ll skip that.
The screenshot shortcut, that is very handy and bringing it into easy reach for people on the TB is great, but many of us who’ve been using keyboards for a long time tend to learn the shortcuts - Shift, Cmd, 3 for instance is the keyboard shortcut for a screenshot. While Shift, Cmd and 4 allows capturing a portion of the screen. And Shift, Cmd, 4 and Space grabs a window or menu.
So, for many of those things, they already exist and for an awful lot of them, have for a long, long time. But they’re one of those, you know or you don’t things.
So I think that’s what the TB can be a great tool for, exposing useful features to people who don’t know about them. That’s partly why I think they should keep it, but still bring back function keys.