1) They are more fragile / have more bugs and don't get tested properly, because it is more work for most "applications" 2) They're slow to start 3) They usua

1) They are more fragile / have more bugs and don't get tested properly, because it is more work for most "applications" 2) They're slow to start 3) They usually lack a good UX (deeplinks, hijacking links, etc)