Law of diminishing returns. With a single coil-over, the heavier the car the more valving needed. More valving means more cavitation. Putting a valve pack in the resi (clicker) to help this creates more cylinder pressure to cure the cavitation at the expense of the seals. Light play car it would not be an issue with or without clickers. There is only so much you can make one shock do before you start trading one problem for another. Something under 2K with a 2.5 CO would be fine as long as it's not trying to run the Baja 1000.
More weight, faster car needs more shock. Also the ability to tune travel zones differently is one of the biggest advancements in off-road. You can set your CO up to deal with chatter and cornering and have the BP to take the large hits without making the mid-stroke harsh. There just really isn't a comparison, 2 shock with different uses that complement each other. No way around it.