I have 7 cars
They all have a specific purpose and pretty much only do one thing well each.
Also a neat trick if you want to do it to avoid the registration and insurance hassles is to buy and sell 5 or so cars a year so you qualify as a dealer and can get dealer tags. That way you can have all the cars you want sitting around and just put the D plate on whatever one you want to drive at that time. A neighbor of mine does that and it is hard to say what car he will be driving from one day to the next.
I think it would be hard to find a car that did everything I needed, it would be a jack of all trades, master of none type of car. Those are most of the time more annoying than not. So my car collection does everything I need done and does it pretty well without having to put up with doing something in a car that it isn't made for.