Oblique styling
It would probably be too much to ask for a complete oblique variant, so here is what I use in case others are interested. The slant value of 0.3 was chosen as a best guess from measurments of long verticals in the italic.
\documentclass{article}
\RequirePackage{fontspec} % note fontspec requires lualatex
\newcommand{\oblique}[1]{{\slshape#1}}
\setmainfont[
SlantedFont={EB Garamond}, % for some reason, it needs to be specified even if it is at the end of the command, otherwise it just shows as italics
SlantedFeatures={
FakeSlant=0.3,
},
]{EB Garamond}
\begin{document}
\emph{Here is an example of Latin: \oblique{Lorem ipsum etc,} and so on}
\end{document}
Renders as:

Treat this "issue" as you wish :)
Thanks a lot! As you might guess, oblique and unslanted styles are not a priority for me or would be automaticaly generated only.
I’ll leave this issue open for now until I know where to best document this.
I think you can use \textsl instead of defining a \oblique command. Or, if you want to use \oblique, define it using \let\oblique\textsl.
I can never remember if \textXX or \XXshape is the right one to use so I just group stuff. Honest thanks I'm probably gonna refer back to this lol