So, the first thing I’d like to mention is that the audience that I write for is mainly outside of the design community. It’s mostly non-designers who have little to no knowledge of the industry. That is why, when I say ‘design’ I mean creative visual graphics like identity, packaging or poster design. They don’t understand the concept of pattern libraries, so my posts are mostly targeted at giving a high level explanation of the picture.
Having said that, I wholeheartedly agree with your point that open source design systems actually brew innovation rather than hinder it. But if they’re open, can you really call it stealing? The design patterns that are available to all were built with the intent to make other designers’ lives simpler, so I don’t believe that the example you cited applies in this situation.
If you read the post, I’ve mentioned a segment about intent. Blatant copying of designs that were not shared with the world for further use might shrink the degree of innovation within the community and that’s what I wanted to highlight.
Once again, this is primarily for graphic design like packaging design or posters. It could apply to UI but since we design for specific operating systems, there exists little room to introduce new styles for tab bars or back buttons etc, which is where pattern libraries help. For the design community, it might seem fairly obvious but what I’m trying to shed light on is that the lines between inspiration and copying are often blurred, leading to intentional plagiarism within the community.
Hope that answers your questions!