There's two worlds here.
There's one world where I just say the favour system is broken, and people nod, and they bring in the most applicable expert with a level of expertise commensurate for the task at hand, and everything works fine.
There's another world where I just say the favour system is broken, and someone immediately tries to get seven Lord Magisters in to do the laundry, one for each day of the week, and I tell them no, and then someone else goes "ooh, there's a line! that means that what I need to do is ask five thousand questions until I learn exactly where the line is! and then we can extract maximum utility from each technically allowed wizard deployment!" and gets fifteen questions deep until I snap at them, and then someone else starts picking at the thread and I end up spending a very resentful hour working out the exact checks and balances.
I don't know if we're in the good place where we can have nice things, or if we're in the bad place where I need to specify the exact height of the bar to the nearest millimeter. I do know I'd rather not predestine us towards the latter.