Being the loudest voice != being the representative of the community.
For example, if THE ENTIRETY of ResetEra (as an example of a very vocal and important community in games) screamed to the heavens about backwards compatibility, if we went rabid here, on social media, everywhere about playing their PS3 games on a PS5, and we were the only ones to use the feature...
.... merely 50.000 users would use it. Out of an estimated 100 million consoles they will sell.
Of course, in reality, more people would use it. But really, we need to understand that the enthuastic people like Era or Reddit or whatever are a very very loud minority. We are not representative of 90% of the people that buy consoles or games.
Normal people want their PS5 to play the newest FIFA, GTA, COD.
Not FIFA 15 and COD World at War.
What Xbox is doing is not adding BC to mainly have more sales, but they're doing it as a reaffirmation of the idea of "Xbox as an unique platform".
Now, don't think I believe Sony is not misguided in this, Xbox has the right idea.
But on a pure business focus,
BC is a small small thing, and people should understand that.