Tech leaders pushing for player-coaches could learn something from Major League Baseball

Coinbase CEO Brian Armstrong. Bloomberg/Getty This post originally appeared in the Business Insider Today newsletter. You can sign up for Business Insider's daily newsletter here. The most at-risk job these days is the one that's just managing other people. Managers got a stark reminder of how close they are to the endangered species list on Tuesday. Coinbase announced it's cutting 14% of its staff, roughly 700 employees, and singled out managers. CEO Brian Armstrong's letter to staff had l...