You may be misunderstanding my humor on this...
Consumers don't want CD players anymore. Consumers aren't buying them. The addition of tools which may be a niche tool, used on a niche product, creates a non-existent demand. While for a very (extremely!) small number of people, this may be useful, for the vast majority, they simply don't give a darn about it.
For those that DO care about it, at this point the vast majority have moved into digital editing on their PCs. So, the concept of copying a disc by using a dual deck with digital level control is basically a niche of a niche as it were. Useful for a very few, and utilized by far fewer, and done properly by manufacuturers even less.
Not that it is that hard to do properly, but to do it properly, track by track, takes an actual concious effort by the end user, and as it turns out, most end users seem to not actually be concious most of the time.
"Is your computer plugged in?"
"Plugged into what?"
"The wall."
"My computer didn't come with a wall."
Gotta watch out for those pesky end users!