Usability of a mobile navigation consisting mostly of accordions?

I have a fairly simple site map with two levels of pages in several categories:

Landing A
- A1
- A2
- A3

Landing B
- B1
- B2
- B3

etc.

Would having a mobile navigation consisting mainly of accordions (which reveal links to navigate to the actual pages) be overwhelming or require too many steps? It'd be two taps for almost all sections to get to the content.

Is it an issue to treat the "Landing A" as an accordion filter, and then create an "Overview" page to show the original "Landing A" content? So, on mobile it would become:

Filter A
-Overview A (What used to be a landing page)
-A1
-A2
-A3

I felt that keeping a long menu with all sections open would be require too much scrolling.