like almost all things, it is a trade-off. The extra bits in the circuit , gain stages, caps, power supply additional input and output cables, possible impedence mismatch and potential to overload preamp AND altering of phase ( above 100-120 HZ the ear is quite sensitive to phase, below not and the wave is big )... all that is traded to shape frequency response....which depending on the recording may need a tweak EVERY song......so yes many any Audiophile has disdain, even for the high end models ( of which there are not many )
I tell people IF you want a nice starter EQ get a McIntosh Labs preamp with that functionality, it is also defeatable and out of circuit in purist mode. You might find a few of the bands effective with a tweak of just 1-3 db
as for the recording chain, not just at live events, very very very few recordings made w zero EQ......even so called audiophile mixing boards have EQ, but it is well executed and phase shift minimized...
have fun
enjoy the music
argue less
listen more
peace