What SQ value does a high end stereo preamp add to a network player?

´´can i use x1 as a pass thru from ht processor for mains?´´  : no

But you could use something like that , from the Lumin to the power amp. and from the AV processor to the power amp.https://goldpt.com/sw2x.html

Then the quality of the power amp is important

I like the goldpoint, too bad no remote.

so with only one source to a stereo pre, it seems unnecesary to get a pre.  
So if only these quality switchers had a remote.  

Yes, i have seen this and with remote.  Seems ok. Considering.

it looks like crap, why is that?  And why not hear about it very much.