but depending upon the timing/implementation, they can be used to shift the balance,
That is exactly what they dont do.
VOTERS during elections can change the direction of that seat, or keep the direction the same.
Just having more elections doesnt shift power if the same party keeps winning the elections.
And yes, it will lead to more elections,
because it will put an end to at least a few 1Name Ballot elections, which are hardly elections at all.