>But is it truly practical to use in 'higher-abstraction' apps like web or mobile?

Yes absolutely. Once you become familiar with the language the barrier is not that high. Familiarity trumps everything else.

That said, since i am not a Web/mobile developer i had collected some resources to help me learn how to use C++ for Web/Mobile apps, you may find it useful;

https://levelup.gitconnected.com/cross-platform-mobile-and-w...

https://github.com/Microsoft/cpprestsdk

https://medium.com/@ivan.mejia/modern-c-micro-service-implem...