I have the media library options for double/click enter set to play and start with selected (see attachment), unless I missed something. It works as expected for the local libraries, but not for CDs, it always plays only the selected track.
I also just noticed there IS an eject button of the bottom of the library, it's just moved to the right; I completely missed it. But neither it nor the context menu entry seem to work reliably either... Unfortunately, I'm not sure why.
The number of us who still use CDs on PC is no doubt vanishingly small nowadays, I don't blame you for investing time elsewhere

At least most of the issues have workarounds.