Why wouldn't someone want them overlaid? It's awkward how the frequency you're actually tuned to is arbitrarily off to the left, but then the parabola in green is in the middle and appears liker some other frequency when you hover your mouse over it.
Not having an Airspy would lead me to believe that something intrinsic to it makes it better suited to autotuning then a $12.99/unit TV tuner device that is a giant kludge.