Thanks for the reply, Stennie! The bit of confusion is at Atlas Device Sync | MongoDB where it says Serverless sync architecture under the Feature overview section. It kinda throws me off a bit as the plan name for serverless is also named Serverless.
It’d be nice if this is spelt out in the feature comparison chart as IMO it’s pretty important. I expect to grow from the Shared plan to Serverless but now it means I have to skip that and go straight to Dedicated.