I’m curious why this is marked as not possible? I know lots of apps that integrate with iCloud Reminders.

iCloud Reminders doesn’t have an API, so we can’t connect to it like we do with other services such as Fitbit or Twitter. We’d have to connect to it via our iOS app only, which would be complicated since the rest of our services are handled by our web app. It’s not technically impossible, but this isn’t something we really want to do. If this suggestion gets very popular we’ll consider it, though.