I don't really see any cross platform framework hitting "critical mass". React Native is very accessible to web developers. Are you sure that is not just information bias from your own situation? For me, most cross platform solutions are a race down to the lowest common denominator (and this is from someone who has used Xamarin Forms and MAUI in production apps.) Sure, you get to use your favourite tech stack (for us it was .Net) and you get familiar tools and metaphors, but the overall results are very uncanny valley unless you put a lot of effort in to styling for each platform.