Early on, sure. I seem to recall Apple having their Human Interface Guidelines early on, which helped, yet there were developers who were either unaware of them or experimenting with different ideas. Other platforms tried to improve consistency later on though. For example: there was CUA for IBM. Of course, most of that went out the windows in the late 1990's and early 2000's when companies figured out that the easiest way to differentiate their products to consumers was visually, rather than technically.
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Early on, sure. I seem to recall Apple having their Human Interface Guidelines early on, which helped, yet there were developers who were either unaware of them or experimenting with different ideas. Other platforms tried to improve consistency later on though. For example: there was CUA for IBM. Of course, most of that went out the windows in the late 1990's and early 2000's when companies figured out that the easiest way to differentiate their products to consumers was visually, rather than technically.