I've seen many iOS projects overwhelmed by tech debt while its Android counterpart was still OK-ish. I don't believe this is coincidence.
So how hard is it to apply React Native the correct way? Having a dedicated team of dozens of engineers including native experts for each platform is different than your average 4-8 people dev (web, API, iOS, Android) team. Let alone if you only have people experienced in web doing the work.
When I build Swift applications the fact they have sub 500ms loads is not an achievement, they're simply already doing that without me trying. But I have found the right way to build iOS apps myself over the years, very little help from Apple.