It may have to do something with the fact that if you cannot trust Apple not to break web apps like they are planning to do now, companies will not invest in web apps.

Also, most companies have native apps already so no need to reproduce them.

Web apps are a future competitor, not a present one. They are really suited for smaller cross platform projects but if you follow how the web evolves, nowadays they are just a serious thing to consider for any kinds of software projects.