Does PS hint direction matter?

As the title says.

I noticed that PS autohinting places the hints “inwards” as applicable. However, when exporting an OTF, and opening in Glyphs, all horizontal hints are upwards. Is this something I should worry about?

Here is an example. The top bar of the E is what I am referring to.

Hints in the binary are always upwards. For me it looks better when the hints start at the zone. It is how they are processed but not how they are stored.

What exactly does this mean? Can they only be upwards as per OT spec? Does Glyphs always write them upwards?

Processed where? Stored where? In the exported font?

The direction in Glyphs doesn’t matter; it will always be exported according to the OT spec (first bottom, then top).

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If the hints always have a positive width in the OTF, what information is added by showing a negative width, or direction, in Glyphs at all?

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Same for the blue dot and triangle/arrow. Is this because they might be automatically converted to TT instructions at some point?

It is partially a misunderstanding on my part a long time ago.