Unfortunately 4x4s got popular to those that think of them as a status thing instead of the tool they were meant to be. The vacuum/electric engagement stuff today is so those who want to look like a rugged individual on their way to the mall or around here in the North Dallas area, Harley shop, can just flip a switch or push a button to engage the 4x4. I prefer a mechanical lever and locking hubs. My Jeep has unit bearing hubs that are similar to those found in the front axle of a 1 ton Dodge or Ford HD pickup. That means I just shift the Atlas T-case into 4wd hi or lo and go on.
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2013 Ducati Multistrada, 08' 530 EXCR, 09' Yamaha FZ-6