Hmm. Interested feature. I'm mixed on it.
Pro: From the sounds of things, you do not get "Quality" Items until you use the Quality Module. So your miners won't be spitting out "Quality" Ore until you put the modules into them. This means that you can beat the game and ignore this system if you don't like it, like the circuit network.
Con: Once you start using Quality Modules, it might be VERY VERY PAINFUL. Not only will they start to take up space in Trains or other inventory locations, they will also end up in places you might not expect, due to the nature of Factorio factories being... intertwined after a while.
Pro: Higher quality items might help alleviate beacon spamming as a strategy in the early late-game.
Con: It might make the end-late-game way, WAY worse as q5 beacons with q5 modules are now so much more effective.
Pro: This does mean your starter base will likely not produce these items, and instead they will be the focus of mega b...