i am considering learning latex, but it looks like it has a steep learning curve compared with markup language like rst or markdown
and also it seems very verbose i.e, presentation and content are written whole/completely
You can, of course, write natively in LaTex but the program wasn't designed for that.
Hard to know precisely what you mean by this, but if you mean that you shouldn't be writing things like
\documentclass{article}
\begin{document}
Hello world.
\end{document}
then you are mistaken; the LaTeX book (and many other documents) describes what to do. If what you mean is that a person is somehow meant to use a front end such as LyX, then you'll get a lot of disagreement (such as from me).