I find the word suggestions very useful. Not while typing, as I look at the screen, but when I make a typo and get a red underline, I can just backspace and the keyboard will make reasonable suggestions. Much more convenient than left clicking on the mistyped word -- I can do all from the keyboard.
There are other cases where it's useful, but many programs implement it poorly (e.g., MS Word). Still I find it useful, if not revolutionary.
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I don't buy this argument. I think it's easier to adjust volume and brightness with the touchbar. You just press and hold, and then you can directly slide. Easier than multiple clicks.