Okay, I realized that you guys are right and I am wrong. Then, let's talk about somewhat different matters.
Say that there is no conclusive evidence yet that a format (CD, HDCD, SACD, DVD-A) matters. In this situation, we can have three different personal positions:
a) I don't know because there is no evidence yet (analogous to agnostics).
b) I believe that a format does not matter (athiest).
c) I believe that a format matters (believer).
Apparently, you guys' choice is a) and mine is c). Right?
Then suppose that there are two players both of which are of very good quality in every way but one of which can play every format but the other can play only CDs. The former is a little more expensive than the latter, of course. We have to make a buying decision on either of these.
In reality, either that a format matters or that a format does not matter are possible, right?---let's make it simple (no in-between situation). With no conclusive evidence available, this is now a probablistic matter. In this situation, which player will you choose personally?
I, for one, will choose the player that plays all. How about you? And why? Because there is no evidence yet, you will not prabably use your personal experience with these formats for this decision making. Right?