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A very limited scope of the filesystem instead of exposing the whole thing. Android does the same thing, and so does every system that doesn’t allow the user to have root access.

Linux on mobile, like pmOS, is great for tinkering, but I wouldn’t use it as a daily driver. The OG Pinephone also has quite weak hardware for the modern age. Pinephone Pro is a bit better, but still slow compared to even something like a OnePlus 6, which also supports Linux on mobile quite well, albeit, still with issues.