Schiit Saga+...What’s the point of the tube?

Just wondering about this. I bought one used because I wanted a passive preamp with 0 gain and remote control. It functions fine and doesn’t seem to color the sound of my inputs at all whether I have it in tube buffer mode or not. 

So then why is there a tube? To sell more units b/c of supposed tube sound? It came with 5 tubes, several NOS American made ones from the 50’s-70’s and some of recent manufacture. I rolled them all and none of my listeners (4 including myself) could hear a difference. 

I’m not into tube voodoo after rolling these tubes and engaging tube buffer mode vs. “normal” mode. Makes me question the value of tube rolling in general. 

I know half of the replies will be bad puns on the Schiit name, but if anyone has a serious reply, I’d be grateful to read it.