As with the many problems with walls not being effective, you choose to ignore the legitimate issues pointed out on the list with the lack of italic standardization for Chinese braille, text to voice readers, etc. The choice of plain text isn't always voluntary. And the existing alternatives, like math italic characters, are problematic.
The underlying issue is the lack of rich text support in places where users expect rich text.
The solution is to find ways to enable rich text layers that are not full documents and make them interoperable.
The solution is not to push this into plain text - which then becomes lowest common denominator rich text instead.
A./
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