True,however,since you dont want to level off at your selected ALT,you would have to disconnect the APP,which leads you to manual flight therefore AT OFF.
You can also chose to select a higher mcp alt....and stay in AP mode with AT engaged....
Now you're being specious and avoiding the point entirely.
Our imaginary pilots are in windshear, they're getting battered around and are concentrating on the performance instruments. They are monitoring the rad alt versus terrain closure and they're keeping an eye on the speed etc. They've decided it's a good idea to leave the A/P & A/T engaged but, with all the other distractions around the place, including ATC etc, they've not seen the FMA change. The rate of climb means the A/T will drag the power back. They don't want to level off but they don't realise they're going to since they haven't noticed the FMA change, therefore they're not going to do the correct thing i.e. manual flight. Likewise, because they haven't noticed the FMA change they don't realise they need to increase the MCP altitude.
I said in the beginning it was an unlikely, but possible, scenario and I stick to that. It is not beyond the whit of man to fail to see that little green box appear on the EADI and appreciate all that it means, especially with all the other things going on. By simply saying they could go to manual flight or increase the MCP altitude, which I know are solutions, you are avoiding answering the question about the reason for leaving the A/T engaged in auto flight. 'Because Boeing say so' is true but it is not an answer worthy of such an august forum
So, come on, why (besides the Boeing procedure) can we not disengage the A/T, in auto flight, once G/A thrust is set, thereby avoiding the possibility of power reducing in the event of altitude acquire?