Users have zero patience for friction. If your checkout takes more than two...

https://garrettwigp625.tearosediner.net/the-smartphone-decade-why-your-users-expect-everything-to-work-in-three-taps

Users have zero patience for friction. If your checkout takes more than two taps, the cart gets abandoned. People now expect one-click ordering and real-time tracking as the baseline. If you force extra logins, users are already hitting uninstall.