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

The passive mode is just variable resistance so the output impedance can get pretty high, up to 4.8k-ohms, which could be an issue with some amps. The active stage is a tube-SS hybrid (I’m not sure of the exact circuit topology) that keeps the output impedance at 180 ohms which should play well with almost any amp. I think the hybrid nature might give less “tube tone” than a typical tube preamp. I’m still pretty new to tubes but I did like a NOS tube better than the stock one, though I’d be hard pressed to describe the exact difference. I like the Saga+ better than using the pre out on my SS integrated, too. Personal taste is personal. Tubes wear out, cost too much and probably aren’t worth it if you can’t appreciate them. 

"...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..."

You have limited experience with vacuum tube audio. Although the Shitt does have a tube in the circuit path I don't know how it's being used and I believe you when you said you heard no difference when the tube was changed. Most full tube audio products do exhibit sonic changes with changes of tubes. Some position of tubes more than others, same with the tubes themselves. It's a real thing not voodoo. 

The Saga is just a tube buffer without gain I believe. It’s designed to be a very subtle difference so you will need a resolving system and pretty good ears to pick up on the tube buffer.

The Freya is a proper active tube preamp with tube gain. The tubes will have a greater impact on the sound.

I've never used the Saga,  but the Schiit website says that you can use the passive mode or run it through the tube.  I suspect you need to push a button or something to switch from passive to tube.  Good Luck

I actually had one here for over a month and then bought one. My buddy went on a vacation and let me use it..

I like, it pretty transparent, with or without the tube gain. It was a good clean well built unit.. Certain tubes have a greater effect, the 67N has a LOT of options.

That little Pre offers a lot for what it is. It's not what I consider "Tubie" AT ALL. Now if you want to hear how the old tube sound can REALLY change with a tube roll, get a Mcintosh C11, 20, 22s. The C20s are the bomb, NO REMOTE though.. uhhh!!!

Yea I say you're a newbie and MIGHT like something different. I just question if you'd enjoy it any more. Adding tube issues it my not be your cup of tea. A great SS may offer more.. Me I gotta have tone control, no matter what it is..

My purchased Freya+ was sent BACK. Had an issue, but great customer service.. just top of the line..

Respect