Unfortunately, a lot of young kids are wired to look for the next Yo and or spend their energy and talents on things that don't really matter. It's crazy out there - the whole "make an app, get users and cash out quickly" mindset. It's very bad and is a major reason why we see so many crap companies and apps launching all the time. But this won't last. Andreessen had a good tweet today "your startup is not the next WhatsApp." And it isn't. The 0.01% chance of this happening, already happened.
There are so many exciting and important problems that need smart people to solve them. Everything you've mentioned from the downright garbage that are EMRs at hospitals, to massive medical devices that can be shrunk, to endless paper work for cops and so many other industries who still use scanning and OCR software to organize their databases. Large but seemingly not-that-complex (from an engineering standpoint) problems. These - these need to be fixed.