Guys,
The main benefit of encirclement is a reduction in the enemy's readiness. This can have a dramatic impact on combat results. Also, the reduced supply means reduced reinforcements. So, the combination of reduced readiness and reduced reinforcements actually works very well and does indeed encourage encirclements. Give it some time and you'll likely agree.
Of course, as has been observed, it may be hard to tell just how well it works until you can get out onto the steppes.