Home Theater Bypass , why am I hearing this now.

I too wanted surround sound" for movies/tv audio and possibly occasional audio use. It's tricky and def a compromise when trying to keep your two channel audio system intact. After a lot of homework I managed to keep my main system and add surround. I have Harbeth SLH5 + as the main fronts and an REL s510 as an audio subwoofer, and a pair of SVS 3000for video subwoofer. I added a denon surrond series integrated amplifier. Took the TV audio out to th eDenon optical input, then the front channel out from the Denon to the Home Theater Bypass input on my Pass re-amp. Took an RCA output from the preamp to the RCA input on the Pass 250.8 amp- that gives me as clean a front channel audio for surround as I can get. Then I run center and rear speakers off of the Denon's powered speaker outputs. When I listen to a movie in surround sound I flip on the HT bypass inout (and turn on the Denon) on the Pass Pre-amp- the front channel audio is running thru my Harbeths and the other channels are coming from the Denon. When I want pure 2 channel audio I just select my normal audio input on the pre amp and it no longer is playing the source fed to it from the Denon. In my case I got lucky- the Pass amp has BOTH balanced and RCA inputs that are "live" at the same time- I run balanced outputs from the Pass pre-amp to the balanced inputs on the Pass amp (for my audio playback), leaving the RCA's coming from the Pass Pre-amp (it has both RCA and Balanced outputs) hardwired to the RCA inputs on the Pass Amp. It's take another paragraph to explain the three subwoofer set up too but it all works seamlessly. 

PS Audio Stellar integrated amp has HTBP, which would allow you to stream Tidal. It is great.   But I warn you, I have been down this exact same route.   I ended up just sticking with an upgrade to my power amp (ps audio S300) and I use the HT receiver more like a pre amp.  Apple TV is the main source for everything.  Works fine for now. 
I have tried all sorts of upgrades in the electronics and not been convinced that they are better.  My rule is if you have to squint real hard to hear a difference , it is not worth the money.  
 I have come to the conclusion that  for me, there is no point in upgrading my system until I get better  L/R speakers.  I currently use JBL 590’s and they are great for what they are.  But all these upgrades I tried cannot be heard through them.  

So I suggest thinking also about the speaker situation. 

PS Audio Stellar integrated amp has HTBP, which would allow you to stream Tidal. It is great.   But I warn you, I have been down this exact same route.   I ended up just sticking with an upgrade to my power amp (ps audio S300) and I use the HT receiver more like a pre amp.  Apple TV is the main source for everything.  Works fine for now. 
I have tried all sorts of upgrades in the electronics and not been convinced that they are better.  My rule is if you have to squint real hard to hear a difference , it is not worth the money.  
 I have come to the conclusion that  for me, there is no point in upgrading my system until I get better  L/R speakers.  I currently use JBL 590’s and they are great for what they are.  But all these upgrades I tried cannot be heard through them.  

So I suggest thinking also about the speaker situation. 

I have 2 amp/preamp setups in my room.

Very easy to do. 

Am with the OP in saying i have heard in past but def moreso recently about HTBP. All of this info above is fantastic and a bit paralyzing not knowing what will be a good solution to my system. I am def in the camp of 60/40 music to HT.

I have a Anthem MRX 720 with Emotiva XPA-5 (250w/ch) paired to GoldenEar Ref Triton One.R and Supercenter Reference. Been reading that my One.R would benefit for music from a better setup likely including HTBP.  

Am all ears to any suggestions/recommendations to better improve my music listening with a budget up to $4K. TIA!!