It's not just the industry, people like to play what they know. If there wasn't a market for remakes and endless sequels, there wouldn't be any. It's not a lack of new ideas, it's more a lack of people accepting or willing to try out new ideas. People simply hate change.

all consoles going forwards should have BC.

With how streamlined the architecture is getting, they really should.

I thought this discussion was about backwards compatibility? Remakes/remasters/ports are separate topic in my opinion. To me backwards compatibility is about taking the same exact disc, or cart (or I guess just digital version these days) and being able to play it in the new console. No additional purchases necessary.

Are you a game maker or game player?  It really doesn't matter what the experience of the game maker is.  What matters is the experience of the game player.

In Super Mario All-Stars (SNES) the games look completely different from their NES counterparts, because they use a different graphics engine.  They are still the same games, because the mechanics, level design, music, etc... are all the same.  The graphics don't really determine what the game is.  Demon's Souls is in the same situation.

If we are to use your movie analogy, then think of the original Star Wars trilogy.  George Lucas updates the the special effects of the explosions using radically different effects technology and nobody minds.  But when he makes Greedo shoot before Han, then a ton of fans go nuts and complain.  The updated visuals did not change the experience, but changing one little story detail did. 

For a movie, the story is the real experience.  For games, the gameplay is the real experience.  If nothing about the gameplay changes, then it's the same game regardless of how it is remade.

If I answer I am you will accept my point?

Regardless. The game maker has the edge defining what their work is. It's hard to believe you say two games that sometimes doesn't share the source code, the developers who worked behind that code and the technology used in the proccess are the same thing

Yes, the player should feel the games are the same or at least extremely similar to each other, that's the point of making a remake (unless the remake purposely wants to cause disruption, like telling another story). You create a remake so the player can have an enhanced experience of something that already exist, but those are still different works

Perhaps, my favorite analogy should be...When Taylor Swift released the re-recorded version of her Fearless album last week she recorded the same lyrics and mostly the same instrumentals only with some new songs, but the key here is "re-recorded". The lyrics and production are mostly the similar, but they was singing it whole again, the musicians behind the recording went to studio again so they could recreate all melodies. In all, it's a new album with the same lyrics and similar instrumental. For the consumer it feels mostly the same, sure I agree, but that's what she wanted to do. Doesn't mean what define a musical record is exaclty the RECORDING (just like in movies is the filming), she recorded everything again and even added new songs, this makes me see this as indeed a new album

That's why I also see live versions of albums as different albums even if all their songs are just re-recorded versions of an already existing work

But of course, we can just agree to disagree 

I don't know if it makes a huge difference in sales, but I definitely appreciate backwards compatibility. There are plenty of people who are into retro gaming as well, so having strong backwards compatibility certainly won't hurt a consoles sales.

I keep my old systems so backwards compatibility has zero value to me.

If I wanna play a PS3 game, I'll play it on my PS3, if I wanna play a Wii U game I'll play it on my Wii U.

This is not true. Graphics are an important part of a videogame experience. They can make two games, with same gameplay and story, two different experiences. That is why playing Super Mario Bros on the NES and playing Super Mario Bros in All-stars are two different experiences, that is why there is a distinction between a remaster and a remake. A remaster is mostly the same experience as the original while a remake gives a new experience based on the original, which of course can be achieved by a completely different graphic presentation.

Not much over the long-term, but yeah it is kinda important. Especially more so at the start of the gen

I wonder if the PS5 and Xbox Series would still be selling out at this rate if they weren't backwards compatible. Because there are barely any new next-gen games releasing right now. Odds are the average next-gen owner is playing Destiny 2 or Grand Theft Auto Online on their new console.

This generation in particular, legacy content will be probably be the most important for the first 2 or so years than for any previous generation ever. With a good chunk of 2021 games getting delayed to 2022 due to global pandemic, you bet legacy content will be important.