

Threat models. I’m not going to care about an attacker both exploiting a niche app via a malformed file and also finding a 0day in the flatpak sandbox (which will be receiving continual updates). If someone can whip both of those up, while also predicting that I will open this file, or somehow feeding it to me, they are well resourced enough that it would take way, way more effort than just updating to stop them.



To be clear here, OP is mentioning that certain apps they are using no longer receive updates. Updating these apps are not an option. I’m not telling people not to update.
But I also think that telling people not to use apps that are no longer receiving updates is unreasonable, especially if those apps don’t touch the network and are confined within the flatpak sandbox.