IMHO it comes down to push notifications. If you install the app then they can proactively annoy ... sorry ... engage you.
I remember how I had all notifications and jingle bells on when I got my first smartphone back in 2015/2016. Nowadays turning off notifications is the first thing I do, and then turning them on for selected apps (e.g., phone, Telegram, etc). It helps I don't have social media apps in my phone, and whatever I use I access it in the browser (e.g., Twitter and Reddit).
I think website notifications in Safari will be fine for techies and others who use HN. But it will make many "normal" people's phones look like notification hell.