Web is simultaneously not really designed for apps but also a sort of golden environment for app development because it is the one thing that ships on nearly every consumer machine that behaves more or less the same with an actual standard.

People bemoan the lack of native development, but the consuming public (and the devs trying to serve them) really just want to be able to do things consistently across phones and laptops and other computing devices and the web is the most consistent thing available, and it is the most battle-tested thing available.