One major annoyance is the lack of automatic vendor prefixing of certain CSS attributes. It doesn't really make sense to add them at run-time. It would be beneficial to the performance to pre-compile the written CSS much like JSX. At that point it might be a small step to include a SASS/LESS hook so it's possible to make the inline CSS stylesheets shorter and more composed.
One major annoyance is the lack of automatic vendor prefixing of certain CSS attributes. It doesn't really make sense to add them at run-time. It would be beneficial to the performance to pre-compile the written CSS much like JSX. At that point it might be a small step to include a SASS/LESS hook so it's possible to make the inline CSS stylesheets shorter and more composed.