Part of the design intent with these various vehicles is more off-road capability, more passenger capacity, more on-road comfort or more payload and towing capacity and you buy what gives you need most if what you need. I wouldn’t say the Expy has reduced capability vs the F350, just different capabilities. Even if there was such a vehicle as a 2018 SD based Excursion, I’d hands down still choose the Expy because the IRS lends itself to a much smoother ride, more 3rd row passenger head room and it’ll still tow anything I’d ever need to no questions asked.