Do Preamps only Need Two Inputs in the New World?

I only use one input (digital), yet still believe a great preamp is a benefit.  I agree keep the Streamer and DAC separate, as I have changed them multiple times while always keeping my preamp.

My new world would be less enjoyable without this full featured beauty, made 1962 to 1969.

https://www.audioclassics.com/detail?detail=MX110&nav=cat

I use a separate unit (Chase RLC-1) to get remote volume, mute, balance

I have a dedicated FM antenna in my attic, aimed at only 1 station's antenna (WBGO JAZZ 88.3), it sounds wonderful, have you thought about that?

and, I bought a CD Player with wheels

that’s got me playing CDs (and SACDs) in my main system more often, happily using a Sony XA5400ES I learned about here

I use AUX for my Reel to Reel Player

and, friends bring their equipment here, I can plug into an unused input of my Chase Remote Line Controller so we can instantly compare a variety of things, as well as play their cartridges in one of my tonearms.

Versatility is far more vital than simplicity for me.

I use one input for my dac, one for my phono preamp, one for my sacd player, and one for home theatre bypass. 

I use the input for my dac 95% of the time. I use it when I stream. 

a good pre does what a good pre does sonically and functionally -- like any piece of gear you choose yours based on your needs, sonically and functionally 

whether any specific user needs one at all is also entirely case specific