I think it's possible to go native -> RN -> native without the whole being a failure. You may have a product that hasn't gained the traction that it should have

I think it's possible to go native -> RN -> native without the whole being a failure. You may have a product that hasn't gained the traction that it should have because you have to build everything twice and just don't have the engineering resources to support that adequately. You move to RN, build out a whole new suite of features, gain momentum (and lots of revenue), and are then able to switch back to native now that you can afford to hire enough engineers to fully support each team. Might Coinbase be rich enough to support native iOS and Android teams? Probably. I'm not trying to litigate Coinbase's decision.