My fear is being stranded somewhere when this method does not work anymore.

If one assurance is not enough, He will follow it with a second and a third.

But let's face it, who was actually taught in class how a half halt feels?

The difference in exposure values between any two lenses isn’t going to be more than half a stop or so.

As mentioned, when working together certain prime lenses, you’ll also get an additional half-stop of compensation.