With a 4WD, you have transfer case fluids, front differential gear oil, driveshaft, and half-shafts to the wheels with CV joints with all the electronics and servo mechanisms. Overtime thats a bunch more maintenance and repair over a 2WD. I wouldn't own a truck as a daily driver without 4WD...
People keep commenting about less maintenance with 2 wheel drive but what does that mean? Nowadays the only real maintenance is greasing driveshafts (depending on model vehicle) and checking the u joints. Theres not much more maintenance than a 2 wheel drive vehicle. I've had trucks my entire life and I've had 4x4 on all of them. I watched a buddy of mine with a 2 wheel drive truck get stuck in a dirt parking lot at a concert, same lot a bunch of cars and other vehicles were parked in, he just managed to get the soft spot and because it was 2 wheel drive he couldnt get out. Much rather have 4x4 and not need it than not have it and need it. Idk why they even make 2 wheel drive trucks to be honest. Maintenance is literally turning 4x4 on like once every few months and checking to make sure the u joints aren't loose. Seems easy to me