I know it's kinda early but I don't see how Starfire doesn't beat beetle.
Do you play Starfire? If so we can play and I can show you the match up.
It would be more advantageous if you gave reasons why it isn't 5-5. There's nothing to really counter argue. I play both characters so I will give my views.
Blue Beetle's ground zoning out damages hers, meaning most damage trades are in his favor. MB blast is extremely useful in this match up as well as it knocks her down and even if you happen to do trait, you have to hold the blast and get punished. Once you eat your 10-11% off that, we regain zoning advantage again. We also have a unique ability to get around her beams that many other characters do not possess at all and can force zoning hesitation. She has options to deal with flight, but you still force her to have to make a lot of additional reads to snipe you and he can bait her with empty jumps, flight cancelled into fall down etc.
Then there's the up close game. Her post blocked shield bash game isn't good at all. Forward 2 and standing 3, her two fast advancing buttons lose to down 1 shield bash or alternatively if he decides to launch for a full combo he can if you attempt those. She can just walk away and the down 1 whiffs, but then there's no challenge involved.
Her air dash is meh too and Beetle's projectile recovery is so fast that it can be very hard for her to navigate in on his zoning without simply walking in on a life lead.
Up close he does fine against her since he can chip her safely and he is very good at armor breaking her MB back 3/forward 3 and her hitbox is weird so sometimes he passes right through her making them both whiff so there's no risk in that exchange since she is in recovery frames too, he can recover to be safe.
The only reason why she doesn't outright lose is because of her great damage, she has some air options to keep him honest and a pretty good set of anti-airs, otherwise this would be 6-4 for sure.