What did you add to your 2 channel system to do HT?

I’m coming at it from my perspective.  I have a dedicated listening room for my 2 channel gear and 2 HT systems elsewhere in the home.  One of these is in the living room and we pretty much use for video only , although I do have an Oppo  203 and a CA CXN 2 channel streamer there.  The streamer mainly plays Internet Radio as background music while we eat.  In the basement my second HT system is split between video and audio.  Both HT systems are 5.1 with identical Anthem AVR.

  I don’t need a 2 channel pass through, therefore.  I like the Anthem AVR, obviously, but for me it’s probably overkill in the Living Room.  A competent Yamaha or Denon at half the price would be fine there, and one of the expensive processors would surely be waisted 

I wonder if the question of the asymptote applies more to to HT than to 2 channel listening.  I ‘m sure that a mega bucks processor et al will sound better for video than a Mid Fi AVR, but would the expensive gear be sonic overkill for videos?.  Even  the most glitzy sound effects can be competently handled by an AVR, and most soundtracks are meant to be background or ambience.  There aren’t to many Alexander Nevsky (Prokofiev) or The Last Waltz type movies out there, where the music was conceived as at least coequal to the video content.  Now if you watch a lot of concert videos, or Blu Ray’s of operas, you might prioritize the sound in a HT system.