I would recommend the combo I have and even electric push button 4x4. I have a Tradesman manual 4x4 lever with the HO and Aisin.
IMO it doesn't make a difference anymore. Like you I don't trust the electric shift reliability and think it's not necessary, but, even with the floor lever: electric is involved for the front differential. Mine likes to shut the light off when I shift out of 4X4 and all 3 Mile Island Style indicates what's commanded not what it is doing: It hangs in 4X4 till it unbinds and can drop out. IE turning hops with the 4x4 light off. (We have had some trouble with the GM electronic shifting over the years mainly the contacts being dirty from not enough use. Running through several shifts can fix that. Don't get me started on the unreliable thermal actuator GM used for the IFS front diff at first. Or burning up 3 IFS differentials because something came loose and ate the gears.)
Now I will suggest you look at the Aisin auto trans in the 2018 as it's as close to a manual as one can get without being a manual. And if you are going to make that leap you may as well order/look for a new 2021 (or 2022) due to used truck prices being insane. IMO the 2020's were way better for throttle lag off the light than the 2018's. I did not like the standard output just over the lag even at 60 MPH.
I have posted about the Aisin being unrefined in rare cases encountering a steep grade: it goes 2-neutral-1 and will test the rear locker if you are heavy on the throttle. The latest flash has it still clunky on a 1-2 shift in a parking lot banging it in about the time I just let off the throttle. All in all it's no worse than being sloppy with a NV5600. The updates have addressed the other shifting problems it had.
Yes, I miss my NV5600 at times.