I was surprised to learn the Sansui had such EQ controls. I figured, given what you've discovered and commented upon RE: "embedding" systems, that EQ wouldn't be something you'd utilize.
I use a Schiit Lokius occasionally, usually to reinforcing lower mids and/or rolling off highs with bright CDs. Although it involves extra cost -- requiring two sets of interconnects-- I value the added flexibility this set-up offers when it comes to tone-shaping. Still, the more dialed-in my system becomes, the less I use the EQ.
I have no experience with LTA, but I've yet to encounter anything but positive remarks about their products, here on the forum.