Why is 2 Channel better than multi-channel?

Multi-channel can be a gimmick to some but when I first used it I was impressed that it provided a very involving listening experience with movies. Fast forward a few years, my interest in it has diminished and I couldn't be bothered sometimes to play a movie using surround sound. Maybe because my first love and priority is two-channel. More recently I am gaining a little more interest in surround sound again and would like to revisit to see what I remember was so exciting.

It is the way we hear. Two channel make one sound with three dimension. I looked into SACD two channel was best; when more came out as multichannel, and I have found the best in NOT movie set-up, but two further out and wider ambient speakers.

You do not have part of orchestra playing in balcony, no. It is not like a movie where the car come from behind you.\

I very much like SACD, but stereo SACD is best.

Because we only have two ears.

What you have now is pretty good. I have near the same in my bedroom; Denon 4802 with three channel power amp. front and surround from the Denon, and centre and two back on amp, which are 4 ohms, and amp does well with load.

Run the 7.1 analogue exit in and you have the new format.

Once you go for a higher-end, the cost goes up by a large margin.

Music only considered, I think most of this has to do with the overall quality of the recordings, 2 ch vs multi. I think it's clear that there's vastly more high quality 2 channel -analog and digital - content and, thus, purity of signal would likely flow through quality 2 channel dedicated setup, sans some multi-channel post processing of the signal..all things equal. If the a hugh percentage of musical source content was simply superb hi-rez, well recorded content on multi channel, as status quo, then I think things would be different. So quality over quantity as a priority, every time, IMO!
Then, whether either scenario is or isn't ever the case, one still needs a high quality setup for all the loudspeakers and corresponding seating and acoustics in same space to take advantage and maximize the sound quality from the setup and speakers! - this is NOT typically the case, I find, from most multi ch setup's, let alone those who don't know how to maximize the sound quality from a basic 2 ch setup! It's just harder to do right, fundamentally.
So, 2 ch is easier to setup and get good sound by default, and better source material in 2 channel mix, equals advantage to 2 ch !
...I still prefer dedicated multi mix for movies, however,..digitally processed in an AV pre/pro out to quality amps and setup, is hard to beat for that medium.