I've heard this argument before.
I don't agree.
Its one more accessory to make my life simpler.
In my years of owning roll up windows, vs electric windows, I've replaced a whole lot more manuals. In fact I've never replaced an electric. Just replaced the brushes after 300,000 miles.
The context of the comment was from a "hardcore" perspective that joeh mentioned. In your window example, if an actuator fails you can't roll down your window unless you pull the door panel and do some major reconfiguring. If a manual window fails you can use some vicegrips and usually get it down.
If your on a trail in Moab Utah and your transfercase actuator fails you could be in serious trouble because you are not locking it in with the actuator. If you have a manual lever and it fails, you can crawl under it with some bailing wire and probably fix it to atleast limp out.
With that said, I don't consider my Toyota a hardcore Offroad vehicle like my k5 on 42s with double transfercases. I will stick with the deer trails as the hardest wheeling for the Tacoma, so the knob on the dash is cool and convenient.