boolean operation STILL almost impossible to use

[Boldlinedesign]

I love Affinity Designer, but I cannot understand why the issues with the boolean operations persist years after they have been flagged repeatedly in the forums. Trying to expand simple strokes and divide and add together parts of these simple shapes results in a ton of errors. When I had discussed this in prior posts to the forum, it was alluded to that "dirty geometry" was the issue - because I had used the pen tool like a brush, building up multiple strokes at times to get the kind of thick to thin lines I wanted. In this case here, I'm using single pen strokes.
I really want to replace Illustrator with Designer - but I cannot understand why such a major component of Designer is still not anywhere closer to being fixed years after the problems began. I literally have to take the design out of Designer and into Illustrator or VectorStyler to expand it and merge cleanly the different parts

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