MJ.
Check your dictionary as to the definition of 'should'.
I say 'should' because you 'may' encounter reduced control authority, especially rolling towards the live engine.
As PACE wrote the emphasis 'should' be on energy management. However, blue line is the magic speed in terms of best lift/drag ratio performance. But one should not be focussed on actually climbing: that may not be possible.
Rustle,
I suspect that that is not the case. Just that the initial learning has not become automatic and proficiency is not maintained.
That is where i came in on the thread, the SEP stall/spin accident rate is also rather poor.