One for simmering sauce, one for boiling pasta, and a third for frying up some sausage, veggies, etc. Three at a time isn't unreasonable if you know how long everything takes and do it in parallel to all finish at the same time.
Mine is very similar to [0]. We use 4 pits max, which i think is comfortable. 7kW combined, it does a kind of qos when you set all pits to max power, which works out just fine. It has pause/resume and a countdown timer per pit that works intuitively. I would say the price is not a holding back factor. That's why I really do not get what people in this thread are talking about.