Okay, from a software engineering perspective you're 100% right. Browsers are a very complex system and they'll continue to grow. But try to see it from a user

Okay, from a software engineering perspective you're 100% right. Browsers are a very complex system and they'll continue to grow. But try to see it from a user perspective. You as a software developer know how your system works. You know what components you used, how to compile and install and how to secure. Your average user (depending on the target audience) doesn't know anything like this. Most users are happy when their current installation works, they often don't want to update, without realizing that this comes with the cost of their security. I feel like webapps are the easier way to keep users with no experience secure.