Flappy
Yes, you can do that, but you proved my point very nicely by stating that the thrust in doing so might be too much, at least not what you wanted. You won't have that effect on a Boeing ..... you will get exactly what you push for.
Another little inconvenient: Try doing your little trick below 100 feet, and that's where most of us would be likely to do it to save the landing, and with the fantastic AB logic ..... you end up with GA thrust!!!! Definitely not what you intended methinks.
Finally, if you do the approaches with manual thrust to avoid such landings, whats the point of having the AutoThrust in the first place? On Boeings you don't disconnect it, it helps you and you can help him, on AB's it's either one or the other.
If you take away the AB or B glasses, any logical thinking pilot would have to admit that the B system is more flexibel, to use a less provocative term.
but that's just my view of the things.