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by huanwin 1799 days ago
Have you considered they might be trading off on aspects that you don't care or don't know about?

As a sibling comment noted, a BOM might be $X compared to buying premade packages from Adafruit/Sparkfun at $X0. But paying $X0 means skipping over $X00 worth (or even $X,000) of schematic capture, board layout, design review, PCB fab, assembly, bringup, and fixing bugs.