LittleNavMap does a good job of being preserved when imported. Just don’t touch it after you load it, otherwise the default MSFS planner steps in and unwinds everything. Go straight to Click to Fly.
ATC improvements are needed, no question, that’s why it’s on the “Backlog” which in Agile Development terms is actually the total share of work remaining, not implied that it’s being held back by other factors.