Why baseball managers matter, and why haven’t A’s given Bob Melvin an extension?

Teams don’t value managers as they once did, which is a shame considering their responsibilities, workloads and overall importance to their organizations.
Not to mention the constant abuse they tend to take.
For many managers, much of the decision-making has been removed from the job description as front-office officials predetermine duties that once were left to the manager, such as drawing up lineups, making bullpen moves and aligning defenders.
As a result, managers are considered mid-level management and, in most cases, tend to be paid far less than head coaches in football and basketball. Dodgers manager Dave Roberts’ salary is $1 million, which is $4 million less than his Los Angeles counterpart, Lakers coach Luke Walton.
Source: Sports