Normally Starfires are actually easier to get out than Wraths. If you're being targeted you just get Owlkin Frenzy procs constantly, and if you're not then Starfire is the lesser evil of the two spells for ranged interrupts (mostly due to being able to heal and CC if you get Arcane locked).
Starsurge still remains your #1 spell for bursting down opponents while DoTs are your over-time pressure, the rest of time you'll gather resources and try to get opportunities for kills. You can even try to play with Full Moon since you can cast it even when you get kicked on Wrath / Starfire (assuming cast school changes to Astral too).
All in all you'll be able to chaincast Starfires just the same as you did in BfA, likely even more if you take Moon and Stars which got a huge buff.