The german philosophy (in LH and others) is to disconnect the A/THR every time disconnect the AP. No matter what Airbus says. I kind of like that.
On the bus i have to disconnect it completely, after i have to sync the thrust levers to the current thrust level first. It is somewhat more cumbersome.
one going manual thrust should be done before 1000ft according to Airbus.
The problem here is that we don't have freaking options when we face that situation!
The A/THR is not doing the job? Disconnect… No, wait! It is too late to disconnect already, So… What the f*** do we do??
Answer: Go around.
That is what it all comes to: go f****n around. No other options. So in this regard, it is clear that the autothrolle system of Boeing is superior. It gives more control. I have to admit it.