Except that each of those sandboxed apps keeps uploading your behavioural and private data pretty much constantly with no ability for you to limit or stop it like you can on the deskop :)
And you can never downgrade to an old version. Or add a firewall that will block ads. Or disable javascript selectively. Or control when programs can run. Or know whether they use crypto safely. Or have any control over when your phone will get patched for the 200-day level 10 RCE bug.
Now I just want to smash my phone with a hammer. Smash it into tiny tiny pieces.