Classical music - live attribute

I have about 580 classical albums in my library, most of them symphonies and concertos.
When focussing on the live attribute, only 63 albums are selected.
Should not most (if not all) classical music have the live attribute per default?
Do not shoot me if I am showing my complete lack of knowledge about classical music.

Live is taken to mean that the recording was made in the presence of a live audience. That’s not always the case for classical recordings.

Ok, thanks for the clarification. Makes (some kind of) sense.