You should ask Reddit. They really really want you to use their app instead of your browser, so there’s obviously something (like tracking).
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.
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).