I certainly hope we are not headed down some semantic rabbit hole about who changed what... but...

The most obvious change.  They have taken the big block ethos to it's end.  They did not only lift block size limitations, but the community has been building applications and uses that encourage as much use of the blockchain as possible.  They ridicule the BTC camp for it's Raspberry Pi nodes and have embraced the idea that nodes (which for them are de facto miners) will be big server farms pushing the boundaries of storage space, network bandwidth and computational resources.

Not only that, but the leaders of this have also pushed forth the idea that censorship resistance was never part of Bitcoin, and that it will be safe for blockchain maintenance to be handled by the anointed few partly because the blockchain will then also be subject to rollbacks, and censorship in cooperation with governments.

I am aware the Satoshi posted on this forum about mining being specialized hardware in server farms etc (I was a lurker back then).  But he also talked about people becoming vigilant about space/bandwith/cpu requirements in the future.  I also never read that he had begun to see that mining and consensus/verification would become two distinct things that could split into specialized groups.  I think Hal got that (and therefore possibly SN too?)   But Satoshi seemed to be of more than one opinion about how mining/consensus would evolve.  But what he did not seem to be two minds on is trust minimization, censorship resistance, and the need to avoid trusted third parties.

And those foundational blocks of Bitcoin are being cheerfully removed by the BSV camp.

I see it talked about very infrequently, but ui do believe one of the reasons for this is there are people who are attempting to use the courts to end up forcing a legal precedent for the keys to the early Satoshi block rewards to be handed over to them by force.  They hope for this to be done on the BTC chain, but they will at LEAST eventually achieve this on BSV.

The whole thing is a giant cluster, ad the fact someone as smart as you can ignore the giant problems here both amazes and concerns me.