Whats diff between. Ht bypass vs using a passive connection-unity gain

integrating a highend tube preamp into ht is a nightmare!

That depends on the preamp. You have to understand that the preamp is not designed to be part of the signal path.

Either the preamp has a HT feature, or it doesn't. If it doesn't, than your 
HT signal is just another input. Your only option is, when you choose that input and assuming your preamp has 0 amplification, to turn the preamp all the way up and forget about it. All control is done from your HT device.

@jumia,

What pre-amp are you using? Is it an active pre-amp or a passive pre-amp? Or does it have a combination of both active and passive output choices?

It is the schiit freya preamp which has passive output and a buffer output for tubes.

so that mixture of outputs can be risky.  Not sure what else passive would be used other than with ht avr, albeit not ideal  Not sure why schiit cant simply allow signal pass thru with out involving a passive output.

Seriously?

Is this some campaign against Schiit?

Or are people just incapable of taking responsibility for their actions?

If you don't like it or know how to use it, why not return it?

At 0 attenuation, the signal is, effectively, passing through.

It's only "risky" if the operator doesn't understand the concept and how it works.