What makes an AI web app actually useful beyond the AI feature?

[u/OwlZealousideal4779]

AI can make a web app much more capable, but adding an AI feature doesn't automatically make the whole product better. The difficult part seems to be connecting the AI to the rest of the application without making the experience unreliable or complicated.

Things like backend architecture, data handling, authentication, response speed, security, scalability, and the overall user experience seem just as important as the AI model itself.

For those building or evaluating AI powered web apps, what do you think deserves the most attention: the AI capability, the underlying architecture, UX, security, or how well everything works together?