I listened to a very interesting podcast episode [1] on the Thinking Elixir Podcast on this subject recently, an interview with John Högberg and Lukas Larsson. Not covered in this blog post but discussed in some detail in the podcast is that because you get standard debugging symbols from the JIT, you will now be able to use gdb and prof and similar tools when working with the BEAM.

[1] https://podcasts.google.com/?feed=aHR0cHM6Ly90aGlua2luZ2VsaX...