No, I thought this volume thing was silly at first but now I understand that it allows it to work simply across all platforms. I do not want to drag out my old PC laptop to have to change settings.
The current system is not intuitive, but it works very well once the user understands it.
I think you underestimate the work involved in maintaining and supporting applications - especially for Windows, MacOS and Linux.
As someone who's created and published software for different platforms most of my life, I understand the maintenance aspect as well as the next guy. Heck, in fact this volume behavior by Cosmos ADC forced me to make changes to my own software! And you're talking about the work involved in maintaining applications!
I also use multiple platforms for audio and measurements, so understand the need for a cross-platform operation. What I find annoying is that I can't defeat the volume-control behavior of Cosmos ADC when I want to, and this often trips me up in my measurements. I'd much rather have a choice to turn this feature off and set one specific mode when I'm doing measurements, and another mode when I'm recording audio. At the moment, I have to be very careful to set the correct volume slider setting and this is made worse because I switch between multiple laptops, PCs and Mac computers and even different versions of Windows multiple times a day.
Here, I did it