The existing buttons are made out of a plastic that wears well when rubbing against their contact-points in the case. The plastics are chosen to be compatible, self-lubricating and “not spalling or rubbing eachother to death”.
I doubt that these metalized buttons have been tested for their long-term wear characteristics.
It is rare to see a game get this wrong, the last one I saw was a Borderlands. If you look at a game’s Steamdb cloud listing, they list Windows’s save location, and then Mac/Linux saves are expressed as a rewrite rule.
Cloud saves on PS are handled quite simply - if you didn’t pay for your very own PS Plus then go fuck yourself. I have lost dozens of Aloy hours on my brother’s PS4.