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It could totally be done natively. The obstacle is how much of the stack you have to write and maintain. There are js libraries that do most of this heavy lifting for you, and CRDTs are pretty new to most devs.

It's just much much easier and cost effective to build a single code base and hit many many targets platforms with it.

Computing history has also shown that publishing efficient lean software doesn't help in the market. At least not over time to market, getting the key features right, and your ongoing costs.