More on the topic of Perfection sims, drink quality, and the Chef/Mixologist project
@TripMy sim bought and drank a Re-traiting Potion (replacing Perfectionist with Foodie) then made one drink.
Though the drink still lacked a tooltip indicating quality, her final task of the Master Mixologist aspiration changed as follows:
Create 5 types of excellent drinks 1/5
Mixing 3 more different drinks changed the "excellent drink" count to 4/5.
Finally, I used "Make Drinks for Everyone" to mix a batch of yet another different drink.
This last batch completed my aspiration, so I'm assuming my sim made 7 excellent drinks.
I have been repairing my game today.
Once it's repaired, I will reload my save and check if my re-traited mixologist's drinks show tooltips.