I was talking about web as technology stack. The tech is battle proven and capable. I had great success in getting some ancient web projects to run locally, less luck with Windows projects and even less with Linux sources.

You are right that by the nature of web the long term stability is not guaranteed. The ecosystem could do more to encourage decoupling and graceful degradation. About 95% of modern web is competing in sharing your data to even more "parties with legitimate interest".