Clojure for the frontend is the best-in-class frontend dev environment that I've worked with. Instant hot code reloading, a browser-connected repl, great debugging tools, and a really nice collection of libraries for getting stuff done. I've never had to use native APIs for iOS and Android, so I can't speak to that from experience, but I know that there's some really nice machine learning work that's done in Clojure[0]. One of the main bits of Clojure philosophy is to just embrace the host platform, and our company has done that very successfully.
I think I agree that there are compromises, but on the whole I've come out pretty far ahead with the tools I get to use. My point, though, wasn't to proselytize for Clojure (even though I do love it!), but to point out that there are ecosystems that have made significant progress towards this idea of convergence, and that some people (me in particular) are very happy to be moving in that direction. I'm excited to see progress on the OS front.
There are lots of great languages I'd love to use, but if you want to target those common frontend platforms, your choice quickly becomes limited.
Libraries like Re-Frame[0] and Reagent[1], as well as build tools like figwheel[2] or shadow-cljs[3] are the best frontend web development tools I have ever used, and I've used Javascript, Typescript, and Purescript professionally with Angular, AngularJS, React, a big 'ol jQuery glob, and Halogen.
[0]https://github.com/Day8/re-frame