What do you mean by that last line? Well for one thing the bar is customizable by each app, but still, from the examples, they show very clear icons of function.

This is already far superior than just F1, F2, etc, which are far far more cryptic than a descriptive icon.

That's the thing, most apps already do use F keys for custom bindings, but you have to manually memorize them for each different app. Here, you at least get to see the correct icon in each program you're using.

And as a bonus, you get variable size buttons, sliding input, colors, and much more that just isn't possible with simple buttons.