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I got that.
If raising your stem is the only goal then obviously a 0° or even positive angle is much more efficient. In terms of aesthetics, that's just not for me then.
The starting point of this was about hiding a big stack of spacers though and not necessarily getting the most upright position with the steerer you have.TLDR: In my opinion, a tall stack stem can look more pleasing than a stack of spacers + stem that results in the same reach and stack.
He is talking about the idea of having spacers to move position up but then having a stem pointing down.