Hello Wolfgang, so if I follow your code examp,e what if I were to edit my code 
to be like this:

\definefontfeature[generalfeatures][default][
    kern=yes, % enables kerning
    extrakerns=yes, % enables extra kerning
    trep=yes, % Enables single and double quotes to show up correctly in text, 
perhaps does more
    liga=yes, % Enables ligatures.
    itlc=yes, % Activates italic correction.
    mark=yes, % Used for positioning diacritical marks (accents, dots, etc.) 
relative to base characters.
    mkmk=yes, % positions diacritical marks relative to other marks
    locl=yes,
    ccmp=yes, % Composes multiple characters into a single glyph or breaks down 
ligatures.
    mode=node,
    protrusion=yes,
    expansion=yes,
    language=dflt,
]

\definefontfamily [myfonts] [rm]        [Times New Roman] 
[features=generalfeatures,dlig=yes,cpsp=yes,% dlig enables times new roman 
ligatures, and cpsp is used by tnr, not aptos]
\definefontfamily [myfonts] [ss]        [Aptos]           
[features=generalfeatures,]
\definetypeface   [myfonts] [mm] [math] [stixtwo]         
[features=generalfeatures,]

\setupbodyfont[myfonts,12pt]

do you think this code is flawed?

Also, do you think you could explain how locl and extrakerns works? do I need 
to have kern=yes for it to enable? how can I test if extrakerns Is working? 
when I just have kern=yes enable, and then enable extra, a pdf that has a 
paragraph using both in code looks the same. locl is something I'm completely 
unsure about.
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