Oomph or pressure?

Yes he does, for amps with low input impedance (<20khoms) that aren’t passive friendly, you need a unity gain buffer (no gain as he infers) and those amps thankfully are very not common place, and are around 5% of the market share. some Class-D and some First Watt, Pass Labs

Any amp that is 33kohm or "industry standard input of >47kohm" or higher is fine for any passive pre without the need for a unity gain buffer.

As for active preamps with gain they are not needed in this world any more, and are a left over from phono days when a preamp needed gain.

Even Pass Labs now has lowered the gain of many of their amps from the common 28-34db, down to the low 20’s, just so his and other high gain preamps can be used with most of the volume range they have, instead of being at 9 o’clock for loud!!

Since all digital sources make way too much voltage to clip any amp made

Not just digital even analogue sources, tuners, phono stages etc etc. Have more than enough voltage to clip just about any poweramp.

Cheers George

Sal,
Autospell got me again! I surely meant appropriately named in referring to the Emotive Audio Epifania. I believe that my post however made it clear that I’m complementing the Epifania and its heightened level of involvement you cited.
Charles 

Hello Ralph, 
I've heard your MP-1 preamplifier with several different amplifiers including my own and find it to be an excellent component.  Could one be ordered by a customer with either no gain or say low gain (10db and less) ?  Just curious. 
Charles 

@charles1dad ,
Are you a manufacturer/designer?
Bob

 I went through a period where I was very interested in passive but ultimately found an active gave me better involvement with the music. I found the passive to lack dynamics and drive in the music basically the same as the complaint in this thread. 
 I do think a passive with the unity gain buffer may be a good compromise as  it's true what atmosphere is saying, there are impedance issues but we do have plenty of game in our systems.