Applies to apps too. The point was, you trust you whole disk to apps, in addition to this.
Article’s claim that websites have same capabilities largely defeats its own argument that websites have less capacity to collect tracking data. Either can be used nefariously if isolation is leaky, and both can be secure if done properly. But sometimes apps are a better default: I would rather not have notes, audio/video recordings, and chats to automatically go to out of device unless I consciously opt in.
Even when privacy is not a concern, there are still plenty of cases when I don’t want the website over the app. I don’t want ebooks reader, music app, bodyweight scale reader, vacuum robot and smart home controls, games to be on the web.
Sure there are plenty of apps that shouldn’t exist, but just as annoying is relentless push for web/cloud tech everywhere just so they can lock you in on a subscription, mine your data behind the scenes, and risk mass leaking all to hackers.
Always use website is a shortsighted advice that doesn’t consider the full picture.