Thank you for those thoughts, very much appreciated! I'm coming at this from UX perspective of what experience me (and other users, especially outside of US) would want and need from "Bitcoin". My question is exploratory about whether the place where our requirements meet with the implementation is on the Lightning boundary or whether that's elsewhere.

In essence, we want to have a fully self-custodial open-source mobile wallet where I can hold balance in two currencies - one in fiat (especially USD) and one in Bitcoin. I want to be able to easily move value between those two currencies on demand and I want to use either to pay for stuff with standardized QRs (i.e. I want the wallet to figure that out for me...).

The main two reasons to want fiat balance are:

• Avoid Volatility: This is not just a meme, higher volatility can easily bankrupt individual or company that have large amount of money "on the line" because of slim margins. Further people in US don't realize that for many countries in the rest of the world, getting access to USD balance would be already thousand times better compared to their current situation. I have this experience and it thoroughly sucks to get USD account from another country and then it's not interoperable with other accounts anyway.
• Onboarding: It'd be much better onboarding experience if I could first start using the wallet for USD and gradually start switching to Bitcoin when I'm ready. We have this already with Strike and CashApp, but we don't have self custodial solution and that sucks (this is again where people outside of US have generally much worse experience...)

Question no. 2: What's your favorite PIN?