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whats the security problem here? all mutations go through the server authority and clients can only load data they have access to. the only thing i see is users being able to read cached versions of private content that was accidentally set to public then private again, and if that happens to you something is wrong with your access controls. and its also not a big deal for most organizations.

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User permission can often be very dynamic. Sync engines (local first ones even more so) give them access to a much larger set if that data in a client side database.

This also makes them much more vulnerable to a data leak/breach if their device gets compromised or stolen as the data is all on their device.

The client having access to only what it needs in terms of data and making that as ephemeral as possible is a big part of defence in depth.

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