Currently, math mode just makes all text italic by default.
This doesn't make sense for some characters with italic variants, like capital Greek characters, which LaTeX renders as non-italic even in math mode.
Math mode should generally support:
Only converting Latin and lowercase Greek characters to italic variants
\sin, \cos, \log, etc to override this italic behavior
(potentially out of scope) different space handling -- ignoring by default, better spacing around operators, etc.
Currently, math mode just makes all text italic by default.
This doesn't make sense for some characters with italic variants, like capital Greek characters, which LaTeX renders as non-italic even in math mode.
Math mode should generally support: