Typically, digital sources have higher output gain than that of a TT/phonostage. So when wired to a preamp, the TT’s lower gain means you need to turn the volume control higher than digital sources.
Not if you can balance levels. I can do it in my phono pre AND my main preamp. Start there before making observations or pundits.
Seven carts from .26 to 4.5 mV all match my DAC’s output.
The dynamic range on vinyl is definitely better than streaming services. Of course McGowan ignores that while trying to sell a "streaming only" network player.