Morally? No reason why, and people are working on it (slowly).
Practically? Because sandboxing breaks lots of things that users and developers like, such as file picking (I hate snaps), and it takes time to reimplement them in a sandbox in the way that people expect them to work. If it requires the developers' cooperation, then it's even slower, because developers have enough APIs to learn as it is.
And to the extent you mitigate some of those user complaints (as flatpak etc. are doing) you are basically re-opening the exact same holes that you developed the sandbox to get away from
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Morally? No reason why, and people are working on it (slowly).
Practically? Because sandboxing breaks lots of things that users and developers like, such as file picking (I hate snaps), and it takes time to reimplement them in a sandbox in the way that people expect them to work. If it requires the developers' cooperation, then it's even slower, because developers have enough APIs to learn as it is.
And to the extent you mitigate some of those user complaints (as flatpak etc. are doing) you are basically re-opening the exact same holes that you developed the sandbox to get away from