Let's make something clear: not everyone uses computing devices
for work.
The iPad is (according to Steve Jobs) first and foremost a post-PC device. So in his cars vs trucks analogy, the Mac (or PC) is the truck, and the iPad is the car.
Why should I buy a truck when I don't need to haul anything, fill the truckbed with stuff, etc?
It's OK for me to get a Camry and call it a day. It's also OK for you to get the most versatile vehicle out there: a pickup, because you need or want to make a Home Depot run for yourself OR a client (personal AND work use).
I can also use my Camry to Uber people around or Doordash food to my neighborhood, or just to deliver food or my family to/from the house.
Now, I can use a pickup truck to Uber people around, but my fuel costs would be higher, my passengers less comfortable, etc.
Thus, there is no right or wrong here, just different tools for different (and sometimes intersecting), er... jobs.