I can’t speak to the vacuums specifically but often the smart devices don’t work at all or lose a ton of functionality if you cut them off from cloud services.

Many smart devices work with the cloud service as a required intermediary meaning commands to control the smart device go from your controller (e.g. your phone) out of your home network to the cloud service, then back into your home network to the device.

This is, in part, a big driver for the self hosted community where the goal is to contain everything within your own network.