Monero is honestly great, I'm a Bitcoiner but I'll admit XMR is literally the only altcoin I use and it clearly has genuine advantages for privacy. I literally used it just a few hours ago in fact. But Lightning is so much better suited to this use case (instantly sending through a messaging app) and Bitcoin is better sound money. Lightning provides decent privacy itself as well - not Monero level, but enough for most people since there's no public blockchain and transactions use onion routing. And fair enough if you don't send fiat via messaging apps but a lot of normies do, so making it just as easy to send Bitcoin is seriously a big deal.