I don't think it really does need too much of a rework though.
I think they should take away life surge, make scales come from high jump/boost jump, change lance mastery 3 to make it so that true thrust and doom spike are just outright upgraded into raiden thrust and draconian fury. Then add the followup boost jump+red mirage dive combo into LotD.
Then next expansion, lance mastery 5 upgrades sonic thrust into new dragon themed thrust, also upgrades wheeling thrust + fang and claw into modern animations. New capstone ability being a followup for nastrond with maybe a white animation themed after hraesvelgr. This ties into the artistic direction of starcross being white themed.
If life surge was removed, then it would not be too overwhelming to manage all of this. Maybe they would have to give us a trait to have LotD last longer too, but if we were able to fit everything in with both life surge charges and 3 nastronds, it would be doable this way too. It's the same amount of oGCD as pre-7.1 dragoon but they're all flexible oGCDs and don't have to be lined up with heaven's thrust or drakesbane, plus the timing for WWT would be consistent and non-variable. You would always have a WWT for your burst windows.
This leans the job's identity completely in the direction of being oGCD heavy during burst windows, and also gives us further red/blue theme with the red mirage dive(boost jump could also have a red animation, and maybe they could call it dragonblood dive), while also giving us a cool hraesvelgr themed nastrond followup.
After that though? What can you really do to advance the job? It would be completely streamlined. Every animation would be modernized, the burst window would be as full as it should realistically be(I find it overwhelmingly packed as is, but life surge and WWT make it more complicated than it would be in this idea), and everything would flow naturally. I guess they could make additions to our combat outside of burst, but it's a delicate balance.