These guys totally deserved a cutscene

They seriously did. I mean, I'm pretty sure they had just as much importance to their planet's arc as the other minor/side characters on their respective planets. 

But, then again, Menahat did have the most side characters. Like, 5 (6, if you count Krux's moments) is a lot compared to 2 and 1 in the other planets. Neal and the giant fish krawl really did steal the spotlight, too, and they both were pretty important to Menahat's arc. And plus, I've got no idea about the budget the team had to allow any more cutscenes (animation, voice acting, etc.), but still, I stand by my statement xD