yes this needs clarifying. When I commented I looked at the already present backlog issues, one being the OpenCamera suggestions, but I didn’t want to derail the discussion. Standalone has the best outlook.
While looking at currently available foss qrcode scanners, all used zxing.core for the qrcode part, but varied in integration and modernness of UI. The older zxing client still has the best Android integration in terms of url schemes it understands and mere utility, you can use it to scan or share Contacts or open Wifis qrcodes. BinaryEye has the better UI and uses more recent Android UI elements that weren’t around when zxing.client was released, but has currently less URI integration.
When default apps can be removed not only via adb but the Launcher too this will maybe defuse the discussion on what are sensible default apps. For me QR Codes are just too useful and ROM size usage is in case of the zxing client below a megabyte.