I assume write efficiency gives you more points for each write, unmovable handler make that your future runs have less of them on the field. So all of it comes to optimising the downtime between runs.
Not saying it contribules in any way to an engaging gameplay, but in an essence, its a solid small optimization incremental game where you optimize for the downtime between runs.
No idea how bad sector bypass works though. Seems that it processes the same speed.
Just a weird curiosity of a game.