Something I found completely counter intuitive with the 2025 steering wheel controls is that they are backwards from every car I've ever encountered; the "up" button goes to the previous preset, "down" goes to the next. (But it certainly was easy to "fix" this, using the audio settings page to flip the order of my presets...)
As expected, the lack of a volume control knob has not been an issue. My C6./Z06 has a volume knob but I only use it about 5% of the time. And none of my entertainment remotes have knobs and that's never been a problem for me.