I would expect that textTransform and letterSpacing controls would be available for all the elements in StylesTypographyPanel within Global Styles.
It's worth nothing these are available for individual blocks within Global Styles > Blocks, but would be more meaningful at a higher surface level. "Headings" is already supported, but "Text", "Captions" and "Buttons" are omitted.
Current
The text element, without textTransform and letterSpacing controls in the top-level Global Styles > Text panel:

Expected
The heading element, with the textTransform and letterSpacing controls:

I would expect that textTransform and letterSpacing controls would be available for all the elements in
StylesTypographyPanelwithin Global Styles.It's worth nothing these are available for individual blocks within Global Styles > Blocks, but would be more meaningful at a higher surface level. "Headings" is already supported, but "Text", "Captions" and "Buttons" are omitted.
Current
The text element, without textTransform and letterSpacing controls in the top-level Global Styles > Text panel:
Expected
The heading element, with the textTransform and letterSpacing controls: