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You are comparing specialization in vertical slices vs. horizontal slices and complaining about the later in favor of the first. Both have their own advantages, and ideally a good management team would make use of both. This is not just in regards to BMAs btw - this is in regards to everything. There are advantages to someone who specialized in human resource management and there are advantages to someone who has experience in the roles you are hiring people to do. Either directions come with a different set of transferable skills.
The problem is that when it became more cost effective to place different horizontal slices in different continents, it got a lot more costly for people to advance between horizontal layers in masses. Some do - immigrate and learn the language and adapt to the culture of the home office - but not in sufficiently significant numbers. This makes it a lot harder to get people with a more vertical experience within an industry.
TL;DR - they stopped looking to hire people with experience from their factories in the US office because the factories aren't in the US.
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