A big benefit is writing the app once and it working everywhere. If it only works on Android, people will just default to the tools tailored to that platform anyway.
But it wouldnโt only work on Android. It would also work on Windows and Unix and any other niche operating system that can run a browser (my Blu-ray recorder has a browser in it). Thereโs a whole world outside Apple/Android. This message brought to you by a browser running on Windowsโฆ
Thatโs theoretically true, but in practice, the desktop experience (screen size, interaction model, etc.) is sufficiently different that adapting it to mobile to get an app-like experience is not that different from building a separate app.
Itโs not at all like building a separate app. All the back-end code is identical - all you have to do is make the mobile version not take up as much screen-space, and thatโs not much work. e.g. on desktop I use icon and text, but on mobile icon only.
