I've had old and new, and manual locking hubs and no lockouts. All have their merits. I don't have lockouts on my jeep. I also don't have a center disconnect. I prefer this setup over the other choices honestly in most cases. Lockouts do have their place though, and I won't even discuss auto locking hubs(puke). Old vehicles tended to be rather simple, and just worked. They also tended to require constant work to keep them running. You also didn't hear about 200k miles on old engines either. Newer engines and vehicles requires greater knowledge and skills and tools to work on. If you have those things, its easier than the old stuff. Injected vehicles are easier to diagnose and repair and running right than any carbed engine. I can also walk around my jeep with it running and not get a headache from the fumes in the exhaust. 75k miles on my jeep, and I'm not even concerned about wear on it yet. IFS vs SFA, again each has its merits. For the casual offroader or wannabe, IFS is more than enough. SFA works ok for paved work, but for offroad use it can be superior as well. There is a place for each in the market, but not a lot left for the old stuff. Carbs are going away even on the older stuff. Less issues with engines running funny on steep grades while rock crawling on a throttlebody injected engine vs a carbed.