Wallet compat has been the biggest learning. WebLN covers browser-native wallets (Alby, etc) but most users are on mobile — Cash App, Strike, Wallet of Satoshi, Phoenix.
So we show a QR code + copy-paste invoice as the primary UX, with WebLN as bonus auto-pay. Every challenge email now includes wallet recommendations for non-Lightning users too.
The conversion bottleneck isn't the protocol — it's 'I don't have a Lightning wallet yet.' Working on making that onramp as smooth as possible.