I can understand the choice to go with a different shape dish on top, both from an in-store perspective (it's been 30 years, and Han is a self confessed car guy), and from a designer perspective
(in production meeting) person A: We need to put the sensor dish back on the Falcon
Person B: It's already back on the 5 foot model.
Person A: Good
Annoying intern: But the round one was torn clear by Lando. If you put it back, the fans and all those crazy folks who disect photos will say that you forgot that. You need to change it somehow.
Person B (rolls eyes) But then there will be endless debate, a flurry of blog posts about whether they like it or not, about how this is THEIR ship...
Person A: It's going to happen either way. Some guy may even describe a meeting about it
Oops. Sorry