Re: 2WD low. There are utility benefits, such as maneuvering trailers on pavement where creeping is useful and a locked front axle is either unnecessary or potentially a problem.
For how I use my truck it's never really been something I missed being able to do. When I need low range it's on trails or snow or that sort of thing where either the front drive is fine or needed.
What I do miss is having a way to get the t-case into neutral.
Kind of the same with the rear locker. I've never honestly been in a spot that I really had to lock it and not been in 4-low or at least going a speed where I absolutely had to be in high range. When you have a spool or auto locker and drive on pavement it's a tolerate sort of thing so if you have a selectable why would you need it?
But there again, I've heard people with boats would find it helpful on ramps, as one example, or maybe if it's a regularly used farm or construction truck. So I'm not saying I've come close to seeing all scenarios and it's not unusual at all for rear wheel drive medium and heavy duty trucks to have rear lockers and no front drive at all. But a muddy construction site is a problem that plain old high range 4WD could solve, too.
The fact is both being ECU controlled is more just inconvenient and irritating than real problems. Having to do the right patting the head and rubbing the belly to pick low range gets old. Especially with a stick since it takes in vehicle speed, brake and clutch pedal status.
I tried tapping on my brake to manually flash my brake lights, but that got old quick.