Why can't messages be managed and synced (deleted) between iOS and MacOS?

I delete on one device and yet they are still on the other. This seems dumb...if I want to delete it I want it deleted on all devices. Why isn't this an option or am I missing something? The point of using Messages on my MacBook is to read and manage them while using my MacBook. My messages/SMS are not in sync. Yes I get them and can read them on both, but I can't MANAGE them on one vs the other. That part doesn't sync and I don't see any option to do so.