There are BTC lighting payments and the podcasting 2.0 movement to compete with Patreon. Mostly for podcasts and music atm but that will change.
Yes, you can go into advanced settings and copy a payment proof. But then how do you get it to a retailer? What does the retailer do with it. It's not part of the normal consumer flow use case, and that tells me that people still think of it like a toy and not a serious tool.
In terms of privacy, I don’t see using Monero as different from using Cash.
But to your point of not being able to use btc normally, in everyday life. Sure, but it's chicken and egg. If artists start to make some serious satoshis, they will naturally look for a nice place to exchange, it will come.
Meanwhile, I can now listen to a music podcast, stream satoshis back, the satoshis are split between podcaster (DJ) and artist. If I boost (send some extra satoshis) during the playing of a song, it goes to that creator.
This is a nice example of such a podcast: https://podverse.fm/podcast/toxrW9Ju1
The comment just got me thinking of crypto currency in general as an alternative. If someone had something to say about Monero, they could see my comment and engage