I used to use a client app like this. But after I switched phones, I never re-downloaded it and have found that using the browser works just as good for such a simple application.
Chrome, firefox, etc on android all either push me to use piles of shortcut icons w/folders (cluttered and exhausting to manage), or click through a hierarchical menu thats 20 clicks away.
[1] https://hnr.app
You absolutely can. Press button to the left of URL bar (don't know how it is called, where you can also enter reader mode) and at the bottom you'll find 100%. Press it and you'll have to A buttons that allow you to scale.
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Getting a push notification or just seeing a little red badge makes me optimize for "be the first to answer". Seeing responses in a polling/async way means I can take a breath, read others' answers, and only respond if somebody else hasn't made the same point already anyway.