Yikes. Gonna have to disagree with you on that. The effect of a wine being aerated/oxidized after being opened and/or decanted is obvious even to a casual wine drinker.
> I now know plenty of wines that reliably taste great (to me) straight out of the gate and keep tasting great through the whole bottle even if I keep it for a couple of days
And, by the same token, the taste of red wine degrades fast and is generally completely unrecognizable within 24-48 hours of opening, even if it's well kept with a fancy stopper.
Reading those two comments of yours makes me seriously doubt your ability to make observations that generalize to other people.