The wallet doesn’t add anything directly useful.
It adds a couple of things which can be useful:
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You have a single receive email, but it’s associated with a full HD wallet, so every receive will generate a brand new unused address for the sender. As the email is static, you could for example post it for donations and not have to worry about people being able to track anything you’ve received. Of course this only works with other Proton users which is kind of pointless, but perhaps it’s the start of some sort of interoperability standard?
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They have support which you can contact, which while almost certainly isn’t important for you, for your aunty it might be useful.
Oh I agree with you. I am a daily crypto user and I have no use for this wallet. I was just offering some things it adds which might be useful.
Lightning is a big missed opportunity. Phoenix is the only wallet I know that has solved this in a user-friendly way.
(I did also mention that it only works between Proton accounts.)