This definitely need more. The whole questline is awesome, but it feels weird. For a while, you were building your relationship with Panam, but when you finally "got her", at the same time, yoh lost her..
Such a minor thing, as for example having the option to come to the camp and spend the night there, with a little cutscene where you sit around the campfire with others, Cassidy playing the guitar etc.. That would do so much. This little thing would make the whole game so much more interesting to me.
Right now, when you finish Panam storyline, then you know that out there, in the desert, three minutes away from you, is your gilfriend, but that is all. There is no reason to go there, because even if you do, she barely greets you.