Yeah, good luck writing a screen reader, a demanding mobile game, a (local) music player, or a warehouse parts lookup app, supporting fully offline use and barcode reading functionality.
In 2025? Sure, you can do some (but not all) of that in a browser? In 2010, when those systems were becoming popular? Absolutely not a chance.
People forget that Apple initially tried this exact approach. On the first iPhone, that's how you were supposed to do apps. People wanted native so much that they were willing to go the extra mile, jailbreak their device, document the undocumented iPhone SDK and write their own toolchain. The user demand for native was clearly so overwhelming that Apple finally relented and gave in.
Even a few years later, Facebook tried hard to have a single, cross-platform HTML5 website instead of bothering with apps. Even then, browsers just weren't there yet, and they probably had the best engineers and resources on that project one could have had for any money.