The tooling is just unstable in general in my experience. You never know when things will get into a bad state and you have to kill everything and clear your caches and restart. And then in my experience styles don't actually behave the same way on iOS and Android. They also continue to make breaking changes so you always have to be worried about not only your own code but your dependencies handling that appropriately. The debugger itself is also prone to crashing and requiring full restarts at inconvenient times. Overall, I feel like the amount of random bullshit and platform specific workarounds I have to do makes it so I'm not really saving time VS having 2 native apps and I'm less confident about the overall quality of my software. There's also A LOT of valuable things in the native SDKs that no quality wrapper exists for, so you're missing out on a lot of productivity benefits of the underlying platforms.