Actually this goes contrary to the way many Electrics are designed (not that I disagree ).

To get the best possible efficiencies most RTF systems are ( unfortunately ) far too close to the edge, and not designed to be pushed to 100% all the time.

The Tower/Hobbico instructions normally tell you this too, especially when there is little overhead available.

I've seen the same in Horizon instructions.

It would be nice if this were not true, but I'm sure the manufacturers would charge even more in that case.

Beginner planes especially should not have this limitation.