mkt,
in very dense areas, a tilt of 10° is quite common.
so a possible tilt of 14° is not “extraordinary”. It could be used for very high sites also (imagine a site on a mountain, 1000m high, and the city at the bottom. Such a tilt could be useful). I can see some uses in hilly areas as well.
Anyway, it’s always good to give the choice. The more the better, isn’t it ?
Plus, it’s interesting to put a high electric downtilt an a bit of mechanical uptilt. That solution reduces the backlobe the most.