Comment by Groxx

As a hater of hidden UI like Apple has been obsessed with for several years (force touch, most of the touchbar, edge swiping (as convenient as it can be sometimes), etc): there is a way, but why would you ever try it:

Touch-and-drag on the volume buttons to immediately drop into a volume slider, relative to where your finger started.

It's a pretty nice interaction, honestly - better in most ways than the buttons alone I think, in part because you can be both more precise and make large changes faster. It's one of the VERY few places where I think the touchbar does something positive[1]. But the vast majority of people who would like to use it have no idea it exists.

[1]: ... except when the touchbar freezes while doing this, and continually sets "max volume! MAX VOLUME! MAAAX VOOOLLLUUUUUUUMMEEE!!!!" several times per second until you do a hard shutdown to stop it from blaring [whatever you were listening to] at you because it's also stealing focus from whatever's on screen so you can't even click the "yes please shut down" button. Then I'm somewhat less fond of it.