On Linux you get to have the “fun” decision of which UI toolkit to use, and pretty sure neither WebkitGTK nor QTWebengine support passkeys or ad blocking extensions anyway, and I doubt more obscure toolkits somehow have more featureful webviews. This might be one of the worst examples of why you should buy Linux. It’s a case of having good building blocks on macOS that are easy to implement but have some restrictions, vs having shitty building blocks (if at all) on Linux.