Which is still quite poor - Thinkpads offer between 1.3 to 1.9mm of travel depending on the model. It is surprising that a $1Trillion computer hardware company cannot design the best keyboard in the world while tiny Lenovo seems to have done much better.
Why would a "pro" user care more thinness and form than the usability of the primary input mechanism?
Add: It's not merely the travel. Lenovo keyboards are so slightly concave which offer perceivably better support for finger tips. The key surface also has a rougher texture instead of being flat, smooth and glossy, which I hope more manufacturers will emulate.