Even though the checklist says you can remove advanced options like object detection and zones I think they should be kept in place for various situations. For example if you live on a busy street and your camera view shows cars driving by, or you have tree shadows and live where windy days are common. I kept my motion detection settings the same when I enabled sentry alerts, though my configuration is such that I capture all human activity on my property, as well as stray cats dogs etc that sentry filters for me exceptionally well. I don't see a need to send 1000 messages a day to sentry for analysis, when a lot of falses can be avoided at the local level in settings. I only have sentry do what only AI can do, and handle the rest locally. Just my thoughts on it.
I agree your strategy may be a better approach. It will also be more responsive since BI can weed out some level of false alerts.
-- Sam from Sentry