Native apps have much more access to lower level APIs and had fixed identity that could be shared with all other apps. The web was always limited by JS access,

Native apps have much more access to lower level APIs and had fixed identity that could be shared with all other apps. The web was always limited by JS access, processing power, network connectivity, and a very fragile identity graph that was routinely reset. That's why Safari's battle on privacy is routinely seen as a misguided effort by most of the adtech industry that knows that SDKs in mobile apps reveal a magnitude more data.