Oops loses to more hate so it's pressured to interact more. Necro ignores Leyline of the Void, Surgical, Endurance, Soul-Guide Lantern, Grafdigger's Cage, Pithing Needle, Doorkeeper Thrull, Dress Down, Stifle. Necro more easily plays around Daze and can sometimes win around Mindbreak Trap, Chalice, Vexing Bauble, Null Rod.
Most disruption gets Necro before you pay the 19 life, so you're still at full life and don't lose to *anything*.
Chancellor on the draw is still good against proactive disruption: Thoughtseize, spheres, Moons. It's just bad against land + free interaction (Force, Grief). Some builds have
Leyline of Sanctity for Grief.
1 weekend of "TurboNecro" is already larger meta share than 2 weeks of Oops & Belcher & Ruby Storm combined:
https://www.mtgtop8.com/format?f=LE&meta=34&a=