That doesn't seem like a solid strategy - for example, here in Australia the current opposition are the ones who did appoint the heads of our national broadcast

That doesn't seem like a solid strategy - for example, here in Australia the current opposition are the ones who did appoint the heads of our national broadcaster (when in Government) and were widely condemned for the political nature of the appointments (actually bypassing an independent selection board to make ideologically motivated appointments) and also for their political interference (or attempts at it) both while in Government and while in opposition (as they are currently). Their attempts at political manipulation is arguably even stronger while in opposition, so if anything they would be even more likely to make politically and ideologically motivated appointments!