Reason: traditional and contemporary or Why should we still speak of reason after all?

There is a riddle in philosophy concerning reason. In tradition, reason was considered our supreme faculty and the very core of philosophy. Think, for example, of Aristotle's praise of reason's capacity for self-cognition (noesis noeseos, Met. XII 9, 1074 b 34 f.). In present times, however, many philosophers want to do without reason at all. Feyerabend paradigmatically proclaimed a "Farewell to Reason".[2] - Instead of the previous highest appreciation, a blank abolishment of reason is today being advocated.

With respect to this riddle, I would like to address two questions. First: How did this change happen? Second: Should "Farewell to Reason" remain our final word in matters of reason?