You can do a lot of things with a Weber Kettle, especially with all of the accessories out there for it and for those that don't want to or can't spend that kind of money for a 360 or something else, they work fine.
I prefer the 360 over the Kettle for these reasons. More durable and should outlast any Weber, has stainless steel grates, has two large tables, retains heat better and uses less fuel, sits up higher, has a better vent system for two zone or indirect cooking, and IMO, is easier to adjust temps with.
With that being said, $149 for the Weber with the ash can vs $799 for the 360 is quite a large cost spread and only you can decide if you want to spend the money. For a lot of people the answer is no. For me, I liked what I saw and spent the money. I liked the first one so well that I bought a second used one.
The only thing I use my Weber Kettle for anymore is to cook wings using the Vortex accessory as it does a great job and I don't have to flip the wings. Anything else I grill or for small smokes, I use the 360 or classic PK.