Hey @bwf - here’s the response from Product:
“This message shows preemptively because we cannot know if there is sufficient memory available until we try it, and if memory is not available the app will simply crash. This is a risk each time we unlock. The error message presents the user with two possible resolutions, either lowering their KDF settings (in this case, lower than 48MB) or configuring biometric unlock.”
“As to why autofill shows this warning and not the app, this is because the memory limits imposed by iOS are different for app extensions than for apps themselves.”