I did an experiment once using my TT and Pioneer RT-909 reel to reel. I connected the phono preamp output to the line in on the reel to reel. Started recording, then dropped the needle on an LP. THEN I turned off the turntable motor, leaving the needle still in the LP groove, and the reel to reel still recording. Walked around the room, clapping, shouting, heavy footfalls, a bit of stomping, and singing.
Guess what? Playing the tape recording back, I could hear almost all the noises I had made while the needle was in the groove and the LP was not spinning! I could hear the claps, the shouts, the stomps, not so much the heavy footfalls.
That was it for me, convinced me to digitize the vinyl monitoring only through headphones...