benjie
No phono cartridge is perfect, either.
Using a test record and distortion analyzer, it can easily be shown that different phono preamps have varying degrees of success in retrieving what’s on an LP. And of course, no phono preamp is perfect - even the best of them add some noise and some distortion, as shown on even manufacturer’s specs.
Why do you think there is information lost between the LP and the phono preamp?
No phono cartridge is perfect, either.