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Since we are cloud-based, our servers are remote to our customers'... and since there's no UDP availability over WAN... Then we had to find a solution to make it work nicely with HTTP. Does it make sense?

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Since when does UDP not work over a WAN/the internet?

Definitely talked too fast! You're right, it definitely works. It's a little bit shadier on WAN but the main reason for the pre-aggregation is that the fire+forget behavior is much harder to scale as a service and would wastefully cost a lot of WAN bandwidth.

Once you have a pre-aggregation and only periodic updates... UDP does not make sense anymore.

HTTP also good for browser clients which could make sense.

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