The Pixel C actually has quite a lot of useful keyboard shortcuts: https://support.google.com/pixel/answer/6326992?hl=en&ref_to...
Haven't really needed a separate delete/backspace key. About the only time I use the separate delete key even on windows/linux is in the file explorer.
Although that's somewhat of a simplification for delete.
Page: Fn+Arrows
Delete: Fn+Backspace
The other reasons would be mostly OS X's arguably smoother and overall consistent GUI and its extensibility (through Automator, scripts, globally modifiable shortcuts and the like) and its Unix'ity.
You could do CTRL-[, but I don't see the [ available on there either (at least obviously).
One of my main reasons for a keyboard on an Android tablet is to be able to access remote SSH sessions, edit files if necessary (vi, etc) and so forth.
For navigating Android
Home — Search + Enter
Back — Search + Backspace
Recent apps — Alt + Tab (same as it ever was)
Missing symbols
Brackets — Use three dots + o for left bracket [, three dots + p for right bracket ]
Back slash — Three dots + equals =
Escape — When would you use this? We don't know. But it lives at three dots + 1