If you need to use a trackpad to write or edit text, then you are already not writing or editing text efficiently: whether you’re being inefficient with a mouse, a trackpad or a finger is irrelevant. They all mean you’re taking your hands from the keyboard, and that’s not helpful. With a properly set up keyboard, the times you need to leave the keyboard should be reduced to the bare minimum.
The Apple Smart / Folio keyboard isn’t there yet: they don’t use some of MacOS’s built-in shortcuts such as cmd-d/n/p etc, and you can’t yet remap the caps lock and enter keys to control. That’s not great, but the keyboard still beats a mouse etc for text entry and editing for most purposes, particularly if you’re using a dedicated writing program such as Scrivener/Ulysses etc.
Of course we can dream and hope that one day they’ll implement vim text editing, but I’m not holding my breath for that one. ;-)