Not completely, at least not for me. LV is great for all the things you mention. But, it burns battery power, and leaving it on for extended periods will heat up the sensor, adding shadow noise.
Most using LiveView in place of MLU aren't leaving it on for extended period of time. Using LiveView is a natural for most landscape work because it is the best way to focus ... if so you already have it on. No need to disable it, then use MLU. As far as battery, for a landscape shooter it's doubtful this will have any affect. I shoot with a friend who has a Canon 5D Mark 3, always uses LiveView and battery is never an issue for him
As far as sensor heating up, theoretically true, but you really do not leave it on for an extended period of time. 30 seconds here, 20 seconds there. If you are only using it as a replacement for mirror lock up we're talking only 4 or 5 seconds, which is pretty insignificant for both noise and battery power. I tested noise with a 5D Mark 2, shooting several blank frames with a lens cap on. To test the sensor I turned LV on for 1 minute, took a shot, repeated immediately for a total of 5 minutes. Processing these with a few exaggerated settings in LR shows the resulting noise, and there really wasn't any difference (more noise) in any of the LV shots.
And unless you use a remote shutter release or trigger the shutter via the timer, pushing the shutter button will cause some small amount of camera shake, regardless of where the mirror might be.
true, but this is true and the same for either LV or MLU, and I don't think anyone suggested using LV negates the requirement to use a remote releae of some kind or self timer.
One thing I haven't seen mentioned (with Canon cameras, I've never tested this with a Nikon) is LV has a slight advantage in reducing possible camera movement. The 1st curtain in Canon's cameras is now electronic ... there is only a second curtain. The second curtain covers the sensor at all times other than during LV or an exposure. If you take a shot with MLU, that curtain remains in place and when the exposure starts must be moved out of the way. If the camera is in LV, the curtain is already open. This means the only possible vibration of the shutter can happen as the exposure ends.
Is this significant? Hard to say, but if looking for the absolute best practice to prevent has much possible vibration, this is the way to go. considering the sensels on the sensor are smaller than a red blood cell it doesn't take much of a vibration to spread light from the intended sensor onto a neighboring sensel.