I remember those times if you mean cologne hochschule für musik und tanzI learned to get along without top felts and wingnuts in conservatory, the lesson and practice rooms. I guess they used to disappear so at some place they stopped replacing them.
Which makes me think of another occasion where you would need them, even with soft playing, is steeper cymbal angles, in the 70s fashion. In the late 90s/early 00s nobody seemed to do that anymore.
