First it makes you immune orcs. I've eaten face of Zruulg's late orc exactly because I was *almost* immune bash.

Second what Matrik said. No lag protective shield checker is tits.

Third with Greeting you also have higher chance for landing bash, so it is quite possible to permalag a giant whom you easily outmelee or a stupid pally.

The most serious opponents here would be maran swordspecs, but well you can't have forsaken thoughts if your aim is kill sealing and not survival.

More or less this build is about sealing a kill and lag for which you have:

Entwine, boosted bash, lash, trip, flurry. Not the most survivable - sure. But definitely one of the most kill sealing.