Application using downlinks as alerts

Hi everyone,
I have a question about the correctness of a project, which mainly involves downlink transmissions

the project involves a sensing device which, on some conditions, receives an alert and triggers mqtt downlink commands to ChirpStark, to schedule confirmed downlink messages to a group of controller endpoint nodes (class C)

as Lorawan has been thought mostly for uplink transmissions, are there any drawbacks on designing a system using downlinks as primary function?
is there a reasonable limit of controller group endpoints and how can I improve reliability?
thank you for the feedback

Hi,
The first limit I can see is the Duty Cycle of the gateway.

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