I'm pretty sure you're right.
Though Bandai wanted a game that snagged the attention of non-fans as well as Macross fans, and then kept them coming back after they played it.
And while the DYRL arcade may not win any points for license accuracy, it's generally regarded as a pretty good game.
Much like Scrambled Valkyrie on the Super FamiCom, which has similarly wierd weapons(well, Hikaru's VF-1SOL has a semi-reasonable loadout, but Max and Millia are packing pretty un-authentic stuff).
The Saturn/PS1 DYRL game is a lot more authentic, but it still makes some concessions for the sake of making a fun game.
A diehard fan isn't always the best person for the job. Someone more distant can more easily see what won't work in the new medium. And arcade shooters won't have mush use for multi-mode vehicles with no diffrences but maneuverability. They're just too darn fast for people to be worrying about modes.
But if you make it new weapons instead... now we're getting somewhere.