If I remember my audio engineering classes correctly, I believe 44.1 was chosen for technical reasons. Like ease of transferring between popular equipment at the time or something. It was also Sony who came up with that standard and there was some back and forth on exactly what they would use. 40khz is really all you need. 44.1khz was chosen more for convenience rather than a necessity.

That point can and will be argued for the rest of time among audiophiles lol. But the short answer is no you aren’t missing out on anything with that kind of setup.

Read about the Nyquist Theorum. Basically it comes down to sample rate (which is essentially the same thing as resolution). As long as the same rate is high enough to reproduce the highest frequency you can hear, there is no noticeable benefit to a higher sample rate. So 20khz being the highest freq humans can hear, 40khz sample rate (CD is 44.1khz) is all you need. Audio doesn’t have the same storage and processing challenges that hi-res video does. So we were able to jump right to full quality audio reproduction as opposed to waiting for technology to catch up like with video.

It gets a bit more complicated with SACD format because they use a different type of audio encoding (DSD). So its not directly comparable with CD that uses PCM encoding. But the theory behind digital audio is the same.

It should be noted that DSD is a Sony creation and as such it is heavily marketed as being “better” than other alternatives. That does not mean that it is.