This might be a late reply (I don't hang around factorio forum actively and only come here for bug searches), but one of the feature of my design is that it keeps the productivity bonus (purple bar).

Specifically,

Once the machine finishes, it emits a "F" signal which increments the counter to ...

well, that's Caveat 1 for you. Too bad it doesn't last.

Still, it will be useful to condense multiple buildings into one for different quality recipes.

Abstract
This paper (read: shitpost) proposes a novel solution to the early game quality farming boostraping problem. Through the use of speed beacon black magic and circuits so complicated that the author already forgot how it works, it is possible to use one building and one recycler to farm a ...