The LA4 certainly isn't "lacking" anything. It's just transparent. But I could say it does 'lack' certain things in the sense of comparison to the CJ tube preamp.
There is a big question. This question is if the human hearing process does really prefers the "technically perfect" recording and sound reproduction. I am not sure. Based on the experience how the uncertainty like vinyl groove noise or tape hiss and other tape species lead to usual listening preference, I would rather say that the technocratic perfection does not go hand in hand with listener's preferences.